CN116022091A - Abnormal locking prevention method, device, equipment and storage medium based on remote locking - Google Patents
Abnormal locking prevention method, device, equipment and storage medium based on remote locking Download PDFInfo
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Abstract
The invention provides a method, a device, equipment and a storage medium for preventing abnormal locking based on remote locking, wherein the method comprises the following steps: acquiring an effective ignition signal of a vehicle; reading local vehicle information in a local memory; reading the unlocking state of the vehicle instrument locking function and binding information based on the local vehicle information; and judging whether the unlocking state of the locking function of the local vehicle instrument and the binding information are consistent, and if not, requesting remote locking snapshot information from the backup storage unit. According to the invention, the remote car locking snapshot information is stored in the backup storage unit, and when abnormality occurs, the remote car locking snapshot information is requested to the backup storage unit and is synchronized to the local memory, so that the probability of abnormal car locking caused by unstable local memory in the Internet of vehicles terminal is reduced, the larger market cost caused by abnormal car locking is saved, and the economic loss is reduced.
Description
Technical Field
The invention relates to the field of automobiles, in particular to an anti-abnormal automobile locking method, device and equipment based on remote automobile locking and a storage medium.
Background
In order to prevent the consumer purchasing the commercial vehicle in the financing mode from paying off on time or maliciously paying off the bad running path, the remote vehicle locking mode is generally adopted to stop the behavior or reduce the economic loss, the remote vehicle locking function is required to be started by issuing a command through the remote vehicle locking platform when the vehicle is purchased in the financing mode for delivery, and the remote vehicle locking function is required to be closed by issuing the command through the remote vehicle locking platform after the vehicle is paid off. The remote car locking function is generally integrated in the car networking terminal, and is realized by adopting a mode of combining active car locking and passive car locking: the active car locking is a car locking mode triggered by the supervision platform through issuing a car locking instruction according to service requirements; the passive locking is also called anti-disassembly locking, which is a locking mode for preventing a driver from avoiding locking supervision or refitting a vehicle instrument to automatically trigger local locking by privately dismantling a vehicle network terminal, and the anti-disassembly locking is based on that after the vehicle network terminal and the instrument remote locking function are opened, no locking heartbeat message or failure of verification of the heartbeat message content is received within a certain period interval, and is regarded as anti-disassembly activation of the locking.
After the remote car locking function of the car networking terminal and the instrument is started, the car networking terminal needs to send a frame of car locking heartbeat message to the instrument according to a CAN channel determined by the car information in a certain period interval, and the car locking heartbeat message contains information such as car networking car locking state information, random numbers, check codes obtained by calculating self ID information and the like; after the remote car locking function of the car networking terminal and the instrument is closed, the car networking terminal does not send car locking heartbeat to the instrument.
Therefore, the mode of triggering abnormal passive locking mainly comprises the following two modes:
vehicle networking terminal and instrument communication overtime locking vehicle: if the vehicle information of the internet of vehicles terminal is lost, the CAN channel which is communicated with the instrument cannot be determined, and the instrument CAN not receive the lock heart in the specified CAN channel and the specified time to lock the vehicle. In another case, the remote car locking function opening state identification is lost, so that the car networking terminal is mistakenly turned off for the current car locking function, and the car networking terminal does not send car locking heartbeat information to the instrument, so that the instrument cannot receive the car locking heartbeat in a specified time, and the car is locked. And when the meter does not receive the heartbeat information sent by the vehicle network terminal within the limited time, the vehicle network terminal is considered to be dismantled to trigger the passive locking.
Failure of instrument verification locking car: when the remote car locking function is started, the car networking terminal CAN transmit ID information of the car networking terminal to the car instrument through the CAN bus, and the process is regarded as a process of binding the car networking terminal and the instrument when the car locking function is started. After the binding relation is established between the vehicle networking and the instrument, the instrument periodically receives the vehicle locking heartbeat information and the check code sent by the vehicle networking terminal through the CAN bus, calculates the check code according to the received vehicle locking heartbeat information and the ID information stored when the vehicle locking function is started, and when the instrument receives the heartbeat message, calculates the check code according to the heartbeat information and judges that the check code is inconsistent with the received check code, the check code is failed to trigger the passive vehicle locking.
Disclosure of Invention
The invention aims to provide an anti-abnormal car locking method, device, equipment and storage medium based on remote car locking, which are used for solving the problem of abnormal car locking in the prior art.
In order to achieve the above object, the present invention provides a method for preventing abnormal locking based on remote locking, the method comprising:
acquiring an effective ignition signal of a vehicle;
reading local vehicle information in a local memory;
reading the unlocking state of the vehicle instrument locking function and binding information based on the local vehicle information;
and judging whether the unlocking state of the locking function of the local vehicle instrument and the binding information are consistent, and if not, requesting remote locking snapshot information from the backup storage unit.
Optionally, when the remote car locking function is opened or the car locking state information is changed, the car locking function opening state and the binding information form a group of snapshot information, and the snapshot information is sent to the backup storage unit for backup storage.
Optionally, the acquiring the effective ignition signal of the vehicle specifically includes: and identifying whether an ON hard-wire signal connected to the MCU is jumped from a low level signal to a high level for 1 second, or continuously receiving CAN data frames within 1S after the CAN data signal is interrupted for 1S, and if so, acquiring a valid ignition signal.
Optionally, the reading the unlocking state of the vehicle instrument locking function and the binding information based on the local vehicle information specifically includes:
according to the read local vehicle information, determining a network for requesting the unlocking state information and binding information of the vehicle instrument locking function;
and sending a request for reading the unlocking state of the vehicle locking function and the binding information to the vehicle instrument, if the request fails, requesting the remote vehicle locking snapshot information from the backup storage unit, and re-reading the unlocking state of the vehicle locking function and the binding information of the vehicle instrument based on the remote vehicle locking snapshot information.
Optionally, after the remote car locking snapshot information is requested to the backup storage unit, firstly judging whether the car information in the remote car locking snapshot information is consistent with the local car information, if so, judging that the instrument is abnormal, and triggering the remote car locking; if the vehicle information is inconsistent, the local vehicle information in the local memory is updated to the vehicle information acquired from the backup memory unit, and the unlocking state and the binding information of the vehicle instrument locking function are read again.
Optionally, after the remote lock snapshot information is requested from the backup storage unit, the method further includes: judging whether the unlocking state and binding information of the locking function in the remote locking snapshot information are consistent with those of the vehicle instrument, and if so, synchronizing the remote locking snapshot information to a local memory for storage.
Optionally, the local memory is an MCU, and the backup storage unit is an MPU.
In addition, in order to achieve the above object, the present invention also provides an apparatus for preventing abnormal locking based on remote locking, the apparatus comprising:
the signal acquisition module is used for acquiring an effective ignition signal of the vehicle;
the local information reading module is used for reading the local vehicle information in the local memory;
the instrument information reading module is used for reading the opening state of the vehicle instrument locking function and the binding information based on the local vehicle information;
and the judging module is used for judging whether the unlocking state of the locking function of the local vehicle instrument and the binding information are consistent, and if not, requesting the remote locking snapshot information from the backup storage unit.
In addition, in order to achieve the above object, the present invention also provides an anti-abnormal locking device based on remote locking, the device comprising: the system comprises a memory, a processor and a remote-lock-based abnormal-lock-prevention control program stored on the memory and capable of running on the processor, wherein the remote-lock-based abnormal-lock-prevention control program is configured to realize the remote-lock-based abnormal-lock-prevention method.
In addition, in order to achieve the above object, the present invention further provides a storage medium, on which an abnormal locking prevention control program based on remote locking is stored, which when executed by a processor, implements the abnormal locking prevention method based on remote locking as described above.
The invention has at least the following beneficial effects:
according to the invention, the remote car locking snapshot information is stored in the backup storage unit, and when abnormality occurs, the remote car locking snapshot information is requested to the backup storage unit and is synchronized to the local memory, so that the probability of abnormal car locking caused by unstable local memory in the Internet of vehicles terminal is reduced, the larger market cost caused by abnormal car locking is saved, and the economic loss is reduced.
Drawings
Fig. 1 is a schematic diagram of a remote locking function architecture according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a first embodiment of an anti-abnormal locking method based on remote locking according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a second embodiment of a method for preventing abnormal locking based on remote locking according to an embodiment of the present invention;
fig. 4 is a block diagram of a device for preventing abnormal locking based on remote locking according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a remote car locking function architecture, in which a vehicle network terminal is based on an mpu+mcu architecture, the remote car locking function is mainly concentrated in an MCU of the vehicle network terminal, and relevant information and parameters of remote car locking are stored in an on-chip flash of the MCU. The MPU of the Internet of vehicles terminal adopts a SIM7600CE-T wireless module of SIMCOM, and the MCU adopts a KF32A152MQV chip which is very popular in China as a main controller. And a serial port is adopted for data communication between the two.
After receiving a remote car locking function opening command of the remote car locking supervision platform, the MPU forwards the opening command to the MCU, the MCU and the car end instrument perform binding operation and open the remote car locking function, and the interaction process is as follows, assuming that the terminal ID is 4221257 and the car model is a car networking terminal of 1:
the vehicle networking terminal sends a request instrument binding through the PCAN network, and the specific message content is as follows:
0x18DA17EE,0x110x340x320x320x310x320x350x57；
if the binding is successful, the content of the instrument reply message is as follows:
0x18DAEE17,0x510xFF0xFF0xFF0xFF0xFF0xFF0xFF；
then the car networking terminal sends a remote car locking function opening instruction to the instrument as follows:
0x18DA17EE,0x120xFF0xFF0xFF0xFF0xFF0xFF0xFF；
if the starting is successful, the content of the instrument reply message is as follows:
0x18DAEE17,0x520xFF0xFF0xFF0xFF0xFF0xFF0xFF；
at this time, the MCU judges that the whole remote car locking function opening instruction is normally executed, and immediately sends a group of car locking snapshot information consisting of car locking function opening state information and binding information to an MPU unit in the vehicle network terminal through the serial port for backup storage, wherein the binding information can comprise car type information, engine type information, terminal ID information and the like.
Meanwhile, when the car locking state information is changed, the MCU also forms a group of snapshot information by the car locking function opening state and the binding information, and sends the snapshot information to an MPU unit in the vehicle network terminal for backup storage.
In the next vehicle ignition period, if the vehicle type parameter of the MCU is lost, the vehicle networking terminal cannot determine whether heartbeat information is sent to the meter through the PCAN or the BCANs, and the meter cannot receive the heartbeat information in a specified time due to the fact that the binding relation is established with the meter, so that the meter considers that the vehicle networking terminal is disassembled to trigger the anti-disassembly locking.
The embodiment of the invention provides an anti-abnormal car locking method based on remote car locking, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the anti-abnormal car locking method based on remote car locking.
In this embodiment, the method for preventing abnormal locking based on remote locking includes the following steps:
step S10: acquiring an effective ignition signal of a vehicle;
specifically, the acquisition of the vehicle effective ignition signal may be achieved by: and (3) identifying whether an ON hard-wire signal connected to the MCU is jumped from a low level signal to a high level for 1 second, or continuously receiving CAN data frames within 1S after the CAN data signal is interrupted for 1S, wherein the two conditions indicate that the vehicle is ignited, and if any one of the two conditions is identified, acquiring a valid ignition signal of the vehicle.
Step S20: reading local vehicle information in a local memory;
in this embodiment, the local memory is an MCU in the vehicle network terminal, the local vehicle information is stored in a flash memory area in the MCU, and the vehicle network terminal reads the local vehicle information by reading the vehicle parameter information of the flash memory area stored in the MCU.
Step S30: reading the unlocking state of the vehicle instrument locking function and binding information based on the local vehicle information;
specifically, according to the read local vehicle information, generally vehicle type parameters, determining whether a CAN network requesting the opening state information of the vehicle locking function of the vehicle instrument and binding information is PCAN or BCANs; if the current vehicle type is 1, the target CAN network is PCAN, otherwise, the target CAN network is BCAN. And then sending a request for reading the unlocking state of the locking function and the binding information to the vehicle instrument through the network.
The method comprises the steps of sending a request for reading the opening state of a vehicle locking function and binding information to a vehicle instrument, wherein the specific message content is as follows: 0x18d a17ee,0x010xff0xff0 xff.
The vehicle instrument returns the unlocking state of the vehicle locking function and binding information after receiving the request, and the response content is as follows:
0x18 dae17, 0x410x420x210x250x70,0x01,0xff0xff. Wherein 0x420x210x250x70 corresponds to 7-bit encoded terminal ID bits 4221257 and 0x01 corresponds to a remote lock function on state.
Step S40: and judging whether the unlocking state of the locking function of the local vehicle instrument and the binding information are consistent, and if not, requesting remote locking snapshot information from the backup storage unit.
Specifically, after the vehicle locking function opening state and the binding information returned by the vehicle instrument are received, the vehicle locking function opening state and the binding information in the local memory MCU are read, whether the local vehicle locking function opening state and the binding information of the vehicle instrument are consistent or not is judged, if so, the internal data of the local memory MCU is considered to be abnormal, and the data synchronization operation is not needed. If the unlocking state and the binding information of the locking function of the local and vehicle instruments are inconsistent, the data stored in the current local memory MCU is considered to be possibly abnormal, and the remote locking snapshot information needs to be further requested to the backup storage unit. In this embodiment, an MPU unit inside the internet of vehicles terminal is used as a backup storage unit.
After the remote car locking snapshot information is requested to the backup storage unit MPU, the method further comprises the following steps: judging whether the unlocking state and binding information of the locking function in the remote locking snapshot information are consistent with those of the vehicle instrument, and if so, synchronizing the remote locking snapshot information to a local memory MCU for storage.
The embodiment obtains the effective ignition signal of the vehicle; reading local vehicle information in a local memory; reading the unlocking state of the vehicle instrument locking function and binding information based on the local vehicle information; judging whether the unlocking state of the locking function of the local and vehicle instruments is consistent with the binding information, if not, requesting remote locking snapshot information from a backup storage unit, solving the problem of abnormal locking and reducing the probability of abnormal locking caused by unstable local memory in the vehicle networking terminal.
Referring to fig. 3, fig. 3 is a flowchart illustrating a second embodiment of a method for preventing abnormal locking based on remote locking according to the present invention.
Based on the first embodiment, in this embodiment, the step S30 includes:
s301: according to the read local vehicle information, determining a network for requesting the unlocking state information and binding information of the vehicle instrument locking function;
the specific procedure is referred to the first embodiment described above.
S302: and sending a request for reading the unlocking state of the vehicle locking function and the binding information to the vehicle instrument, if the request fails, requesting the remote vehicle locking snapshot information from the backup storage unit, and re-reading the unlocking state of the vehicle locking function and the binding information of the vehicle instrument based on the remote vehicle locking snapshot information.
Specifically, if the instrument reply message is not received in the request message 10S for sending the read-out state of the locking function and the binding information, the communication is considered to be overtime, and then the request message is resent. If the request fails after retrying for three times and still times, the request is considered to be problematic, and the request is converted into the request of remote car locking snapshot information from the backup storage unit MPU, and the car type parameters are extracted from the remote car locking snapshot information.
After requesting the remote car locking snapshot information from the MPU, firstly judging whether the car type parameters in the remote car locking snapshot information are consistent with the local car type parameters, if so, judging that the instrument is abnormal, and triggering the remote car locking; if the vehicle information is inconsistent, the local vehicle information in the local memory MCU is updated into the vehicle information acquired from the backup storage unit MPU, and the vehicle meter locking function opening state and the binding information are read again.
The method can solve the problem of abnormal locking caused by abnormal vehicle type parameters in the local memory MCU.
Referring to fig. 4, fig. 4 is a block diagram showing the structure of an abnormality preventing device for locking a car based on remote locking according to the present invention.
As shown in fig. 4, an apparatus for preventing abnormal locking based on remote locking according to an embodiment of the present invention includes:
a signal acquisition module 401, configured to acquire a vehicle effective ignition signal;
a local information reading module 402, configured to read local vehicle information in a local memory;
the meter information reading module 403 is configured to read a vehicle meter locking function unlocking state and binding information based on local vehicle information;
and the judging module 404 is configured to judge whether the unlocking state of the locking function of the local vehicle instrument and the binding information are consistent, and if not, request the remote locking snapshot information from the backup storage unit.
The embodiment obtains the effective ignition signal of the vehicle; reading local vehicle information in a local memory; reading the unlocking state of the vehicle instrument locking function and binding information based on the local vehicle information; judging whether the unlocking state of the locking function of the local and vehicle instruments is consistent with the binding information, if not, requesting remote locking snapshot information from a backup storage unit, solving the problem of abnormal locking and reducing the probability of abnormal locking caused by unstable local memory in the vehicle networking terminal.
In an embodiment, the remote car locking device further comprises a backup module, wherein the backup module is used for forming a group of snapshot information by the car locking function opening state and the binding information when the remote car locking function opening state or the car locking state information is changed, and sending the snapshot information to the backup storage unit for backup storage.
In one embodiment, the signal acquisition module 401 is specifically configured to: and identifying whether an ON hard-wire signal connected to the MCU is jumped from a low level signal to a high level for 1 second, or continuously receiving CAN data frames within 1S after the CAN data signal is interrupted for 1S, and if so, acquiring a valid ignition signal.
In one embodiment, the meter information reading module 403 is specifically configured to:
according to the read local vehicle information, determining a network for requesting the unlocking state information and binding information of the vehicle instrument locking function;
and sending a request for reading the unlocking state of the vehicle locking function and the binding information to the vehicle instrument, if the request fails, requesting the remote vehicle locking snapshot information from the backup storage unit, and re-reading the unlocking state of the vehicle locking function and the binding information of the vehicle instrument based on the remote vehicle locking snapshot information.
Further, after the remote car locking snapshot information is requested to the backup storage unit, firstly judging whether the car information in the remote car locking snapshot information is consistent with the local car information, if so, judging that the instrument is abnormal, and triggering the remote car locking; if the vehicle information is inconsistent, the local vehicle information in the local memory is updated to the vehicle information acquired from the backup memory unit, and the unlocking state and the binding information of the vehicle instrument locking function are read again.
In an embodiment, the device further includes a synchronization information module, configured to determine whether the lock function open state and the binding information in the remote lock snapshot information are consistent with the lock function open state and the binding information of the vehicle instrument after the remote lock snapshot information is requested from the backup storage unit by the determination module 404, and if so, synchronize the remote lock snapshot information to the local storage for storage.
In an embodiment, the local memory is an MCU and the backup storage unit is an MPU.
Other embodiments or specific implementation manners of the anti-abnormal vehicle locking device based on remote vehicle locking can refer to the above method embodiments, and are not described herein.
The embodiment of the invention also provides an anti-abnormal car locking device based on remote car locking, which comprises: the system comprises a memory, a processor and a remote-lock-based abnormal-lock-prevention control program stored on the memory and capable of running on the processor, wherein the remote-lock-based abnormal-lock-prevention control program is configured to realize the remote-lock-based abnormal-lock-prevention method.
The embodiment of the invention also provides a storage medium, wherein the storage medium is stored with an abnormal locking prevention control program based on remote locking, and the abnormal locking prevention control program based on remote locking is executed by a processor to realize the abnormal locking prevention method based on remote locking.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. read-only memory/random-access memory, magnetic disk, optical disk), comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. A method for preventing abnormal locking of a vehicle based on remote locking, the method comprising:
acquiring an effective ignition signal of a vehicle;
reading local vehicle information in a local memory;
reading the unlocking state of the vehicle instrument locking function and binding information based on the local vehicle information;
and judging whether the unlocking state of the locking function of the local vehicle instrument and the binding information are consistent, and if not, requesting remote locking snapshot information from the backup storage unit.
2. The method for preventing abnormal locking of a car based on remote locking of a car as claimed in claim 1, further comprising: when the remote car locking function is opened or the car locking state information is changed, the car locking function opening state and the binding information form a group of snapshot information, and the snapshot information is sent to the backup storage unit for backup storage.
3. The method for preventing abnormal locking of a vehicle based on remote locking of the vehicle according to claim 1, wherein the step of obtaining the effective ignition signal of the vehicle specifically comprises the steps of: and identifying whether an ON hard-wire signal connected to the MCU is jumped from a low level signal to a high level for 1 second, or continuously receiving CAN data frames within 1S after the CAN data signal is interrupted for 1S, and if so, acquiring a valid ignition signal.
4. The method for preventing abnormal locking of a vehicle based on remote locking of the vehicle according to claim 1, wherein the reading of the unlocking state of the vehicle meter locking function and the binding information based on the local vehicle information specifically comprises:
according to the read local vehicle information, determining a network for requesting the unlocking state information and binding information of the vehicle instrument locking function;
and sending a request for reading the unlocking state of the vehicle locking function and the binding information to the vehicle instrument, if the request fails, requesting the remote vehicle locking snapshot information from the backup storage unit, and re-reading the unlocking state of the vehicle locking function and the binding information of the vehicle instrument based on the remote vehicle locking snapshot information.
5. The method for preventing abnormal locking of the car based on remote locking of the car as claimed in claim 4, wherein: after the remote car locking snapshot information is requested to the backup storage unit, firstly judging whether the car information in the remote car locking snapshot information is consistent with the local car information, if so, judging that the instrument is abnormal, and triggering the remote car locking; if the vehicle information is inconsistent, the local vehicle information in the local memory is updated to the vehicle information acquired from the backup memory unit, and the unlocking state and the binding information of the vehicle instrument locking function are read again.
6. The method for preventing abnormal locking of the car based on remote locking of the car as claimed in claim 1, wherein: after the remote car locking snapshot information is requested to the backup storage unit, the method further comprises the following steps: judging whether the unlocking state and binding information of the locking function in the remote locking snapshot information are consistent with those of the vehicle instrument, and if so, synchronizing the remote locking snapshot information to a local memory for storage.
7. The method for preventing abnormal locking of a car based on remote locking of a car according to claim 1, wherein the local memory is an MCU and the backup storage unit is an MPU.
8. An apparatus for preventing abnormal locking of a vehicle based on remote locking, the apparatus comprising:
the signal acquisition module is used for acquiring an effective ignition signal of the vehicle;
the local information reading module is used for reading the local vehicle information in the local memory;
the instrument information reading module is used for reading the opening state of the vehicle instrument locking function and the binding information based on the local vehicle information;
and the judging module is used for judging whether the unlocking state of the locking function of the local vehicle instrument and the binding information are consistent, and if not, requesting the remote locking snapshot information from the backup storage unit.
9. An anti-abnormal car locking device based on remote car locking, characterized in that the device comprises: a memory, a processor, and a remote-lock-based abnormal-lock prevention control program stored on the memory and operable on the processor, the remote-lock-based abnormal-lock prevention control program configured to implement the remote-lock-based abnormal-lock prevention method according to any one of claims 1 to 7.
10. A storage medium, wherein a remote-lock-based abnormal-lock prevention control program is stored on the storage medium, and when the remote-lock-based abnormal-lock prevention control program is executed by a processor, the remote-lock-based abnormal-lock prevention method according to any one of claims 1 to 7 is implemented.
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