CN113920710B - Electronic checking system for subway passenger information - Google Patents
Electronic checking system for subway passenger information Download PDFInfo
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- CN113920710B CN113920710B CN202111157374.0A CN202111157374A CN113920710B CN 113920710 B CN113920710 B CN 113920710B CN 202111157374 A CN202111157374 A CN 202111157374A CN 113920710 B CN113920710 B CN 113920710B
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/80—Arrangements in the sub-station, i.e. sensing device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The utility model relates to a subway passenger information electronic check system, check system is including infrared sensor, on-the-spot monitor terminal and the general monitoring center that connects gradually, still be equipped with front end information processing circuit, doublestage allies oneself with triode data processing circuit and the data output circuit that connects gradually between infrared sensor and the on-the-spot monitor terminal. The front-end information processing circuit can receive the external information acquired by the sensor, and performs threshold judgment and hierarchical filtering processing on the external information, so as to primarily process the acquired signal data. The data processing circuit of the dual cascade triode utilizes the amplification function of the dual cascade triode to amplify the data, and improves the processing capacity of the follow-up integrating circuit. The data output circuit can finish signal voltage stabilization and anti-interference processing, so that the time for storing signals is reduced, and the purity and the utilization rate of the signals are improved.
Description
Technical Field
The application relates to the field of subway information and information checking systems, in particular to a subway passenger information electronic checking system.
Background
With the gradual improvement of urban level nationwide, urban rail transit is rapidly developed. The subway becomes one of the necessary track traffic construction of fast city of economic development, simultaneously is also one of the tools that people often select for going out. The electronic verification system for subway passenger information in the prior art has the following problems: 1. the existing nuclear detection system has low body temperature identification precision and low speed; 2. the existing checking system has weak driving force and low output result accuracy; 3. the existing nuclear detection system has weak anti-interference capability.
As shown in fig. 1, in the information processing circuit in the prior art, the circuit adopts a multi-channel signal acquisition mode, three amplifiers TL072 form two-stage amplification, the amplification factor can be completed by adjusting the resistance value of a resistor R10, the practical range of the whole circuit is improved, however, the whole information processing circuit lacks a high-performance filter circuit, has weak anti-interference capability, and meanwhile, the whole information processing circuit adopts the design of the amplifiers, passive devices such as the resistor, the capacitor and the like, has poor driving capability and slow processing speed.
As shown in fig. 2, the schematic diagram of the amplifying circuit in the prior art adopts two-stage amplification, and uses the closed loop effect of the amplifier to realize signal transmission and amplification, so that the circuit structure is simple and the cost is low, however, due to excessive use of the amplifier chip, the driving capability of the circuit is reduced, and signal distortion phenomenon occurs in severe cases.
As shown in fig. 3, the filtering circuit in the prior art adopts a two-stage low-pass filtering design, which can ensure that the low-frequency signal can pass smoothly, and has a very wide practical range, however, the bandwidth of the filter is determined by the values of the resistor and the capacitor around the amplifier, so that a large frequency bandwidth is difficult to achieve, the filtering effect on clutter signals with low frequency is poor, and the anti-interference capability is weak.
Disclosure of Invention
To above-mentioned technical problem, this application provides subway passenger information electronic check system, check system is including infrared sensor, on-the-spot monitor terminal and the general monitoring center that connects gradually, still be equipped with front end information processing circuit, doublestage allies oneself with triode data processing circuit and the data output circuit that connect gradually between infrared sensor and the on-the-spot monitor terminal, after receiving infrared sensor's output signal with signal transmission to doublestage allies oneself with triode data processing circuit, the doublestage allies oneself with triode data processing circuit carries out signal amplification and signal stabilization to the signal after input data output circuit, data output circuit is connected with on-the-spot monitor terminal.
The front-end information processing circuit comprises a diode D3, wherein the positive electrode of the diode D3 is connected with the output end of the infrared sensor, and the negative electrode of the diode D3 is connected with one end of a resistor R1, one end of a resistor R4 and one end of a resistor R9; the other end of the resistor R1, the other end of the resistor R4 and the other end of the resistor R9 are connected with one end of the resistor R2, the emitter of the triode Q2 and one end of the resistor R13, and the other end of the resistor R2 is connected with the collector of the triode Q2 and the power supply VCC; the base of the triode Q2 is connected with the other end of the resistor R13, the collector of the triode Q5 and one end of the capacitor C9, the emitter of the triode Q5 is grounded through the resistor R23, the other end of the capacitor C9 is grounded, and the base of the triode Q5 is connected with the two-stage cascade triode data processing circuit.
The two-stage triode data processing circuit comprises a resistor R19, one end of the resistor R19 is connected with the base electrode of a triode Q5 of the front-end information processing circuit, and the other end of the resistor R19 is connected with one end of a resistor R14, the output end of an amplifier U2A and one end of a capacitor C6; the other end of the capacitor C6 is connected with one end of a resistor R12, one end of a resistor R18, one end of a resistor R25, the anode of a diode D1 and one end of a capacitor C10, the other end of the resistor R18 is connected with the non-inverting input end of an amplifier U2A, the other end of the resistor R12 is connected with one end of a resistor R8 and the base electrode of a triode Q1, and the other end of the resistor R8 is connected with one end of a capacitor C4; the collector of the triode Q1 is connected with one end of a resistor R6, the base of the triode Q3, the cathode of a diode D1 and the collector of the triode Q6, and the emitter of the triode Q3 is connected with a two-stage cascade triode data processing circuit; the emitter of the triode Q6 is connected with one end of a resistor R22, the base of the triode Q6 is connected with one end of a resistor R20, the other end of the resistor R20 is connected with the inverting input end of an amplifier U2A, one end of a resistor R24 and one end of a resistor R11, and the other end of the resistor R11 is connected with one end of a capacitor C3; the other end of the capacitor C3 is connected with the power supply VCC, and the power supply VCC is grounded with one end of the capacitor C1, one end of the capacitor C2, one end of the capacitor C5, the other end of the resistor R14, the other end of the capacitor C4, the emitter of the triode Q1, the other end of the resistor R6 and the collector of the triode Q3, and the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C5, the other end of the resistor R24, the other end of the resistor R25, the other end of the capacitor C10 and the other end of the resistor R22 are grounded.
The data output circuit comprises an amplifier U1A, wherein the non-inverting input end of the amplifier U1A is connected with the emitter of a triode Q3 and the base of a triode Q7 of the two-stage triode data processing circuit, the inverting input end of the amplifier U1A is connected with one end of a resistor R3 and one end of a resistor R10, and the other end of the resistor R3 is connected with the output end of the amplifier U1A and one end of a resistor R5; the other end of the resistor R5 is connected with one end of the resistor R17 and the grid electrode of the field effect transistor Q4, and the other end of the resistor R17 is connected with one end of the resistor R15, one end of the resistor R16 and one end of the capacitor C8; the other end of the resistor R15 is connected with the other end of the resistor R10 and the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected with one end of the resistor R21; the other end of the resistor R16 is connected with the emitter of the triode Q7, and the collector of the triode Q7 is connected with the other end of the capacitor C8 and one end of the resistor R26; the drain electrode of the field effect tube Q4 is connected with one end of a capacitor C7, one end of a resistor R7 and the input end of a field monitoring terminal, the other end of the resistor R21, the other end of a resistor R26, the other end of the capacitor C7 and the source electrode of the field effect tube Q4 are grounded, and the other end of the resistor R7 is connected with a power supply VCC.
(III) beneficial effects
The design can realize the high precision and fast body temperature measurement of subway passengers. The two-stage cascade triode in the circuit is utilized, so that the driving capability of current is improved, and the accuracy of a system result is improved. The output end impedance matching circuit is added, so that the anti-interference capability of an output signal can be enhanced. After the front-end information processing circuit receives the external information acquired by the sensor, the external information is subjected to threshold judgment and hierarchical filtering processing, and the acquired signal data is primarily processed; the data processing circuit of the double cascade triode utilizes the amplification function of the double cascade triode to amplify the data, so that the processing capacity of the follow-up integrating circuit is improved; the data output circuit can finish signal voltage stabilization and anti-interference processing, so that the time for storing signals is reduced, and the purity and the utilization rate of the signals are improved.
Drawings
Fig. 1 is a schematic diagram of a prior art information processing circuit.
Fig. 2 is a schematic diagram of an amplifying circuit of the prior art.
Fig. 3 is a schematic diagram of a prior art filter circuit.
Fig. 4 is a schematic circuit diagram of the present application.
Detailed Description
The invention is further illustrated below with reference to examples.
The application provides a subway passenger information electronic check system, which comprises an infrared sensor, a field monitoring terminal and a general monitoring center which are sequentially connected, wherein the infrared sensor is used for detecting the body temperature of an incoming passenger, the field monitoring terminal is used for processing body temperature data output by the infrared sensor, alarming and prompting abnormal body temperature data, the general monitoring center is in wireless connection with the field monitoring terminal, and abnormal data of each field monitoring terminal is synchronously displayed and alarmed; and a front-end information processing circuit, a two-stage cascade triode data processing circuit and a data output circuit which are sequentially connected are also arranged between the infrared sensor and the field monitoring terminal. As shown in fig. 4, a front-end information processing circuit, a two-stage cascade triode data processing circuit and a data output circuit which are sequentially connected are further arranged between the infrared sensor and the field monitoring terminal, the front-end information processing circuit receives output signals of the infrared sensor and then transmits the signals to the two-stage cascade triode data processing circuit, the two-stage cascade triode data processing circuit amplifies the signals and stabilizes the signals and then inputs the signals to the data output circuit, and the data output circuit is connected with the field monitoring terminal.
The front-end information processing circuit is mainly used for receiving external information acquired by the sensor, judging the threshold value of the external information, performing hierarchical filtering processing on the external information and performing preliminary processing on acquired signal data. The collected signal firstly passes through a diode D3 to filter out direct current components in the collection environment, then voltage quantization is carried out through a resistor R1, a resistor R4 and a resistor R9, the line and the signal are transmitted into the emitter of a triode Q2, and meanwhile, the signal passing through the resistor R1 and the resistor R2 is used as the collector of the triode, so that the same amount of superposition in the signal can be filtered out. The signal from the base electrode of the triode Q2 is directly transmitted to the collector electrode of the triode Q5 for synchronous transmission, and then the amplified signal is transmitted to the next stage through the amplifier U2A.
Specifically, the front-end information processing circuit comprises a diode D3, wherein the positive electrode of the diode D3 is connected with the output end of the infrared sensor, and the negative electrode of the diode D3 is connected with one end of a resistor R1, one end of a resistor R4 and one end of a resistor R9; the other end of the resistor R1, the other end of the resistor R4 and the other end of the resistor R9 are connected with one end of the resistor R2, the emitter of the triode Q2 and one end of the resistor R13, and the other end of the resistor R2 is connected with the collector of the triode Q2 and the power supply VCC; the base of the triode Q2 is connected with the other end of the resistor R13, the collector of the triode Q5 and one end of the capacitor C9, the emitter of the triode Q5 is grounded through the resistor R23, the other end of the capacitor C9 is grounded, and the base of the triode Q5 is connected with the two-stage cascade triode data processing circuit.
The data processing circuit of the dual cascade triode uses the dual cascade triode to make an amplifier to amplify the data, thereby facilitating the integration at the later stage. The signal from the amplifier U2A enters the base electrode of the triode Q6, is amplified by a fixed multiple, and then is output from the collector electrode, and is transmitted to the triode Q3 after being simultaneously wired with the acquisition signal which is not amplified and passes through the diode D1, and is transmitted to the next amplifier U1A through an emitter follower formed by the triode Q3. Meanwhile, the triode Q6 and the triode Q3 form a two-stage cascade of triodes, after data amplification is carried out, the cascade of triodes and operational amplifiers are connected by utilizing an emitter follower, signals are input into the non-inverting input end of the amplifier U2A, and negative feedback is formed between the output end and the triode Q7 for further processing of the data. Firstly, a signal enters into the non-inverting input end of the amplifier U2A through a capacitor C6 and a resistor R18, the capacitor C6 is mainly used for eliminating self-excitation oscillation of the amplifier, an output signal is input into the collector of the triode Q6 through a diode D1, and meanwhile, the output of the amplifier also enters into the base of the triode Q1 through a series voltage division circuit formed by a resistor R12 and a resistor R8 to be amplified by a fixed multiple. The triode Q6 and the resistor R20 form a switching circuit, the base electrode input of the triode Q6 is also an input signal of the negative end of the amplifier, so the triode Q6, the amplifier U2A and the diode D1 jointly form a negative feedback circuit, when the amplitude of an output signal is larger, the signal can be transmitted to the collector electrode of the triode Q6 through the D1, the current of the base electrode can be correspondingly increased according to the current effect of the triode, the voltage at the resistor R24 is increased, the signal of the inverting input end of the amplifier U2A is also increased, and the amplitude of the output signal of the amplifier is further reduced, so that the purpose of negative feedback is achieved. The resistor R11 and the capacitor C3 mainly play a role in isolating the power supply ripple interference, so that the feedback signal is cleaner. The resistors R12 and R8 form a series voltage dividing circuit, the output signal of the amplifier is sampled in equal proportion according to the difference of the ratio of the two values, and the resistor R25 is used for eliminating the zero drift of the amplifier and keeping the voltages of the positive input end and the negative input end the same. The capacitor C4 and the capacitor C3 act in the same way, so that the interference of a power supply is reduced. One end of the resistor R14 is connected with the power supply voltage, and the other end of the resistor R is connected with the output end of the amplifier, so that the direct-current load voltage value of the output signal of the amplifier is improved, and the subsequent signal processing is facilitated.
Specifically, the two-stage triode data processing circuit comprises a resistor R19, one end of the resistor R19 is connected with the base electrode of a triode Q5 of the front-end information processing circuit, and the other end of the resistor R19 is connected with one end of a resistor R14, the output end of an amplifier U2A and one end of a capacitor C6; the other end of the capacitor C6 is connected with one end of a resistor R12, one end of a resistor R18, one end of a resistor R25, the anode of a diode D1 and one end of a capacitor C10, the other end of the resistor R18 is connected with the non-inverting input end of an amplifier U2A, the other end of the resistor R12 is connected with one end of a resistor R8 and the base electrode of a triode Q1, and the other end of the resistor R8 is connected with one end of a capacitor C4; the collector of the triode Q1 is connected with one end of a resistor R6, the base of the triode Q3, the cathode of a diode D1 and the collector of the triode Q6, and the emitter of the triode Q3 is connected with a two-stage cascade triode data processing circuit; the emitter of the triode Q6 is connected with one end of a resistor R22, the base of the triode Q6 is connected with one end of a resistor R20, the other end of the resistor R20 is connected with the inverting input end of an amplifier U2A, one end of a resistor R24 and one end of a resistor R11, and the other end of the resistor R11 is connected with one end of a capacitor C3; the other end of the capacitor C3 is connected with the power supply VCC, and the power supply VCC is grounded with one end of the capacitor C1, one end of the capacitor C2, one end of the capacitor C5, the other end of the resistor R14, the other end of the capacitor C4, the emitter of the triode Q1, the other end of the resistor R6 and the collector of the triode Q3, and the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C5, the other end of the resistor R24, the other end of the resistor R25, the other end of the capacitor C10 and the other end of the resistor R22 are grounded.
The data output circuit is mainly used for signal voltage stabilization and anti-interference processing. The signal line amplified by the amplifier U1A and the signal of the emitter of the upper triode Q7 are input into the field effect tube Q4 together, an impedance matching network is formed by the signal line, the resistor R7 and the resistor R17, and the output signal is subjected to direct current filtering by utilizing the ground filter capacitor C7. The output signal of the double cascade triode data processing circuit is output from the emitter of the triode Q3, then enters the non-inverting input end of the amplifier U1A and the base electrode of the triode Q7 respectively, the amplifier U1A and the resistor R3 form a negative feedback circuit, the output signal of the U1A is fed back and input to the inverting input end of the U1A through the resistor R3, the output of the amplifier is regulated, the output of the amplifier is stabilized near the positive input signal, and then the output of the amplifier is transmitted to the grid electrode of the field effect transistor Q4 through the resistor R5; triode Q7 and resistance R26, electric capacity C8 constitute emitter follower amplifier circuit, and the magnification is one, mainly carries out smooth transition with the signal. Then the output signal is output through the emitter of the triode, and reaches the grid electrode of the field effect tube Q4 together with the output signal through the amplifier U1A through the resistor R17, and then the output signal and the output signal are output through the drain electrode of the field effect tube Q4. The capacitor C7 functions to filter the voltage ripple of the last output signal.
Specifically, the data output circuit comprises an amplifier U1A, wherein the non-inverting input end of the amplifier U1A is connected with the emitter of a triode Q3 and the base of a triode Q7 of the two-stage triode data processing circuit, the inverting input end of the amplifier U1A is connected with one end of a resistor R3 and one end of a resistor R10, and the other end of the resistor R3 is connected with the output end of the amplifier U1A and one end of a resistor R5; the other end of the resistor R5 is connected with one end of the resistor R17 and the grid electrode of the field effect transistor Q4, and the other end of the resistor R17 is connected with one end of the resistor R15, one end of the resistor R16 and one end of the capacitor C8; the other end of the resistor R15 is connected with the other end of the resistor R10 and the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected with one end of the resistor R21; the other end of the resistor R16 is connected with the emitter of the triode Q7, and the collector of the triode Q7 is connected with the other end of the capacitor C8 and one end of the resistor R26; the drain electrode of the field effect tube Q4 is connected with one end of a capacitor C7, one end of a resistor R7 and the input end of a field monitoring terminal, the other end of a resistor R21, the other end of a resistor R26, the other end of the capacitor C7 and the source electrode of the field effect tube Q4 are grounded, and the other end of the resistor R7 is connected with a power supply VCC.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (3)
1. Subway passenger information electronic check system, its characterized in that, including infrared sensor, on-the-spot monitor terminal and the general monitoring center who connects gradually, its characterized in that: the front-end information processing circuit receives output signals of the infrared sensor and then transmits the signals to the two-stage cascade triode data processing circuit, the two-stage cascade triode data processing circuit amplifies the signals and stabilizes the signals and then inputs the signals to the data output circuit, and the data output circuit is connected with the field monitoring terminal;
the two-stage triode data processing circuit comprises a resistor R19, one end of the resistor R19 is connected with the base electrode of a triode Q5 of the front-end information processing circuit, and the other end of the resistor R19 is connected with one end of a resistor R14, the output end of an amplifier U2A and one end of a capacitor C6; the other end of the capacitor C6 is connected with one end of a resistor R12, one end of a resistor R18, one end of a resistor R25, the anode of a diode D1 and one end of a capacitor C10, the other end of the resistor R18 is connected with the non-inverting input end of an amplifier U2A, the other end of the resistor R12 is connected with one end of a resistor R8 and the base electrode of a triode Q1, and the other end of the resistor R8 is connected with one end of a capacitor C4; the collector of the triode Q1 is connected with one end of a resistor R6, the base of the triode Q3, the cathode of a diode D1 and the collector of the triode Q6, and the emitter of the triode Q3 is connected with a two-stage cascade triode data processing circuit; the emitter of the triode Q6 is connected with one end of a resistor R22, the base of the triode Q6 is connected with one end of a resistor R20, the other end of the resistor R20 is connected with the inverting input end of an amplifier U2A, one end of a resistor R24 and one end of a resistor R11, and the other end of the resistor R11 is connected with one end of a capacitor C3; the other end of the capacitor C3 is connected with the power supply VCC, and the power supply VCC is grounded with one end of the capacitor C1, one end of the capacitor C2, one end of the capacitor C5, the other end of the resistor R14, the other end of the capacitor C4, the emitter of the triode Q1, the other end of the resistor R6 and the collector of the triode Q3, and the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C5, the other end of the resistor R24, the other end of the resistor R25, the other end of the capacitor C10 and the other end of the resistor R22 are grounded.
2. The subway passenger information electronic check system according to claim 1, wherein: the front-end information processing circuit comprises a diode D3, wherein the positive electrode of the diode D3 is connected with the output end of the infrared sensor, and the negative electrode of the diode D3 is connected with one end of a resistor R1, one end of a resistor R4 and one end of a resistor R9; the other end of the resistor R1, the other end of the resistor R4 and the other end of the resistor R9 are connected with one end of the resistor R2, the emitter of the triode Q2 and one end of the resistor R13, and the other end of the resistor R2 is connected with the collector of the triode Q2 and the power supply VCC; the base of the triode Q2 is connected with the other end of the resistor R13, the collector of the triode Q5 and one end of the capacitor C9, the emitter of the triode Q5 is grounded through the resistor R23, the other end of the capacitor C9 is grounded, and the base of the triode Q5 is connected with the two-stage cascade triode data processing circuit.
3. The subway passenger information electronic check system according to claim 1, wherein: the data output circuit comprises an amplifier U1A, wherein the non-inverting input end of the amplifier U1A is connected with the emitter of a triode Q3 and the base of a triode Q7 of the two-stage triode data processing circuit, the inverting input end of the amplifier U1A is connected with one end of a resistor R3 and one end of a resistor R10, and the other end of the resistor R3 is connected with the output end of the amplifier U1A and one end of a resistor R5; the other end of the resistor R5 is connected with one end of the resistor R17 and the grid electrode of the field effect transistor Q4, and the other end of the resistor R17 is connected with one end of the resistor R15, one end of the resistor R16 and one end of the capacitor C8; the other end of the resistor R15 is connected with the other end of the resistor R10 and the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected with one end of the resistor R21; the other end of the resistor R16 is connected with the emitter of the triode Q7, and the collector of the triode Q7 is connected with the other end of the capacitor C8 and one end of the resistor R26;
the drain electrode of the field effect tube Q4 is connected with one end of a capacitor C7, one end of a resistor R7 and the input end of a field monitoring terminal, the other end of the resistor R21, the other end of a resistor R26, the other end of the capacitor C7 and the source electrode of the field effect tube Q4 are grounded, and the other end of the resistor R7 is connected with a power supply VCC.
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