EP4341051A1 - Verfahren und system zum betreiben einer maschine - Google Patents
Verfahren und system zum betreiben einer maschineInfo
- Publication number
- EP4341051A1 EP4341051A1 EP22717106.3A EP22717106A EP4341051A1 EP 4341051 A1 EP4341051 A1 EP 4341051A1 EP 22717106 A EP22717106 A EP 22717106A EP 4341051 A1 EP4341051 A1 EP 4341051A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- model
- values
- filter
- machine
- basis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Program-controlled manipulators
- B25J9/16—Program controls
- B25J9/1602—Program controls characterised by the control system, structure, architecture
- B25J9/161—Hardware, e.g. neural networks, fuzzy logic, interfaces, processor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Program-controlled manipulators
- B25J9/16—Program controls
- B25J9/1628—Program controls characterised by the control loop
- B25J9/163—Program controls characterised by the control loop learning, adaptive, model based, rule based expert control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Program-controlled manipulators
- B25J9/16—Program controls
- B25J9/1628—Program controls characterised by the control loop
- B25J9/1641—Program controls characterised by the control loop compensation for backlash, friction, compliance, elasticity in the joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Program-controlled manipulators
- B25J9/16—Program controls
- B25J9/1628—Program controls characterised by the control loop
- B25J9/1653—Program controls characterised by the control loop parameters identification, estimation, stiffness, accuracy, error analysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Program-controlled manipulators
- B25J9/16—Program controls
- B25J9/1674—Program controls characterised by safety, monitoring, diagnostic
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B17/00—Systems involving the use of models or simulators of said systems
- G05B17/02—Systems involving the use of models or simulators of said systems electric
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/04—Architecture, e.g. interconnection topology
- G06N3/048—Activation functions
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/04—Architecture, e.g. interconnection topology
- G06N3/0499—Feedforward networks
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/08—Learning methods
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/08—Learning methods
- G06N3/09—Supervised learning
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/33—Director till display
- G05B2219/33028—Function, rbf radial basis function network, gaussian network
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/33—Director till display
- G05B2219/33039—Learn for different measurement types, create for each a neural net
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/35—Nc in input of data, input till input file format
- G05B2219/35308—Update simulator with actual machine, control parameters before start simulation
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37493—Use of different frequency band pass filters to separate different signals
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/40—Robotics, robotics mapping to robotics vision
- G05B2219/40527—Modeling, identification of link parameters
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/41—Servomotor, servo controller till figures
- G05B2219/41132—Motor ripple compensation
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/41—Servomotor, servo controller till figures
- G05B2219/41154—Friction, compensation for friction
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/41—Servomotor, servo controller till figures
- G05B2219/41232—Notch filter
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/42—Servomotor, servo controller kind till VSS
- G05B2219/42121—Switch from bang-bang control to dead beat, finite time settling control
Definitions
- the present invention relates to a method for operating, in particular controlling and/or monitoring, a machine, in particular a robot, and a system and computer program or computer program product for carrying out the method.
- Models used here often include non-linearities, for example resistances in drive trains, including friction and drive torque ripple, so-called ripple or cogging, or model them (with).
- the object of the present invention is to improve the operation of a machine.
- a method for operating a machine has the steps: a) determining learning error values based on model values, which are determined using a first model and a second model based on machine state values, and based on reference values of the machine, in particular by comparing the model values and reference values; b) Filtering of the learning error values determined using a first filter and calibration, in particular machine (further) learning or training, of the first model on the basis of these learning error values filtered using the first filter; c) Filtering of the (same) learning error values determined using a second filter and calibration, in particular machine (further) learning or training, of the second model on the basis of these learning error values filtered using the second filter; and d) operating the machine based on model values that are determined using the calibrated first model and the calibrated second model based on machine state values.
- One embodiment of the present invention is based on the idea of using appropriate (first or second) filters to specifically filter out effects that result from a nonlinearity (modeled by the second or first model), so that the corresponding nonlinearity can be learned better by machine .
- effects that result from the or one or more other nonlinearity(s) can be reduced, in particular for machine learning in each case of a nonlinearity or calibration of a model.
- the first and second models can be improved, in particular better calibrated or machine-learned, and the operation of the machine can thereby be improved with the aid of these models, in particular precision and/or reliability can be increased.
- the first and second model can be integrated together in an (overall) model.
- Operation within the meaning of the present invention can in particular include controlling and/or monitoring, in particular being, with regulation also being generally referred to as controlling for the sake of a more compact representation.
- the machine can in particular have a robot, in particular a robot, which in one embodiment has at least three, in one embodiment at least six, in a further development at least seven, joints or (movement) axes, in one embodiment a robot arm with at least three , in one embodiment at least six, in a development at least seven, joints or (movement) axes.
- the present invention is particularly suitable for this purpose, in particular due to the dynamics of robots and the requirements when controlling or monitoring, without being restricted thereto.
- the first and/or second model is a nonlinear model or models a nonlinearity or a nonlinear effect, in one embodiment friction, a drive torque ripple or the like.
- a calibration of a model within the meaning of the present invention can include, in particular, machine learning or training of the corresponding model.
- the sequence of steps a)-d) is repeated cyclically, with the model values being determined in a current cycle in step a) using the first and second model calibrated in steps b), c) of a previous cycle.
- the first and second models are (further) calibrated while the machine is working or being operated model-based, in one embodiment the robot is moving or being operated model-based.
- the operation of the machine can be (further) improved.
- the first model has a function approximator based on parameter-weighted, non-periodic, basis or activation functions in one embodiment, a radial basis function network or a general regression neuronal network in one embodiment.
- the basis or activation functions can have, in particular, be Gaussian bell curves or the like.
- the second model has a function approximator based on parameter-weighted, in one development periodic, base or activation functions, in one embodiment a harmonically activated neural network.
- a calibration of the model can then include, in particular, vary the (parameter) weighting of the corresponding basis or activation functions.
- a non-linearity mapped by the first model is non-periodic and/or a non-linearity mapped by the second model is periodic, as is the case, for example, with friction and drive torque ripple, the operation of the machine (further) improved, in particular a precision and / or reliability (further) increased.
- the one of the first and second filters comprises, in particular may be, a notch filter or a band-stop filter.
- the other of the first and second filters has a bandpass filter that is preferably complementary or opposite to the notch or bandstop filter, and can in particular be such a bandpass filter.
- complementary bandpass and notch or bandstop filters have notch frequencies or frequency bands that correspond at least substantially to one another, with frequencies that are (strongly or more strongly) reduced or (away) filtered from the notch or bandstop filter Bandpass filters are not or little (er) reduced and vice versa. In one embodiment, these notch frequencies or frequency bands correspond to a periodicity of the second model.
- a non-linearity mapped by one of the models is non-periodic and/or a non-linearity mapped by the other of the models is periodic, as is the case, for example, with friction and drive torque ripple
- machine learning or corresponding model is improved, in particular better calibrated, and thereby the operation of the machine is (further) improved with the help of these models, in particular precision and/or reliability are (further) increased.
- the first filter is a machine state value-adaptive filter whose filter behavior varies with the machine state values.
- the second filter is a machine state value-adaptive filter whose filter behavior varies with the machine state values.
- the frequency band of the bandpass filter and/or the notch frequency or the frequency band of the notch or bandstop filter depends on the machine state value for which or at which the respective learning error is determined; in one embodiment, the notch frequency or the Frequency band of the notch or band-stop filter and/or the band-pass filter of a speed, in particular speed, of the machine, with the machine state values including corresponding speed values, in particular speed values, in particular can be, or has the notch frequency or the frequency band of the notch or
- the bandstop filter and/or the bandpass filter records the respective machine state or speed value, in particular the rotational speed value.
- the machine learning or corresponding model can be improved, in particular better calibrated, and the operation of the machine can thereby be (further) improved with the aid of these models, in particular precision and/or reliability can be (further) increased.
- model values and reference values depend on forces and/or torques of the machine, and in one embodiment can have forces and/or torques of the machine.
- the machine state values depend on speeds, in particular rotational speeds, of the machine, can in particular have speeds, in particular rotational speeds, of the machine in one embodiment.
- the present invention is particularly suitable for this, in particular due to the characteristics of such model or reference values or machine state values, without the invention being restricted thereto.
- a system according to an embodiment of the present invention is set up, in particular in terms of hardware and/or software, in particular in terms of programming, for carrying out a method described here and/or has:
- Means for determining learning error values based on model values obtained using a first model and a second model based on machine condition values are determined, and based on reference values of the machine;
- a system and/or a means within the meaning of the present invention can be designed in terms of hardware and/or software, in particular at least one, in particular digital, processing unit, in particular microprocessor unit ( CPU), graphics card (GPU) or the like, and / or have one or more programs or program modules.
- the processing unit can be designed to process commands that are implemented as a program stored in a memory system, to detect input signals from a data bus and/or to output output signals to a data bus.
- a storage system can have one or more, in particular different, storage media, in particular optical, magnetic, solid-state and/or other non-volatile media.
- the program can be designed in such a way that it embodies or is able to execute the methods described here, so that the processing unit can execute the steps of such methods and thus in particular can operate the machine.
- a computer program product can be a, in particular, computer-readable and/or non-volatile storage medium for storing a Program or instructions or with a program stored thereon or with instructions stored thereon, in particular be.
- execution of this program or these instructions by a system or controller causes the system or controller, in particular the computer or computers, to perform a method described here or one or more of its steps, or the program or the instructions are set up to do so.
- one or more, in particular all, steps of the method are carried out fully or partially automatically, in particular by the system or its means.
- the system includes the machine.
- Fig. 1 a system when operating a machine according to an embodiment of the present invention.
- FIG. 1 shows on the one hand (the construction) a (it) system(s) for operating a machine according to an embodiment of the present invention and on the other hand a method for operating the machine according to an embodiment of the present invention carried out thereby.
- the system includes a multi-axis robot 1 and its controller 2.
- a control and/or monitoring means 3 of the controller 2 receives machine status values from the robot 1, for example speeds w of its drives.
- a learning error means 4 receives controller setpoint torques MR as reference values from the control and/or monitoring means 3 and from a model means 5, which has a first model in the form of a general regression neuronal network 6 for modeling friction in one or more of the drive trains of the robot 1 and a second model in the form of a harmonically activated neural network 7 for modeling drive torque ripple in this drive train or these drive trains, corresponding model-based calculated engine torque MM as model values.
- the learning error means 4 determines learning error values e by subtracting these model values and reference values from one another.
- the learning error values e1 filtered using the first filter 8 are supplied to a training means 10, which trains the first model 6, in particular varying its weightings of base or activation functions in the form of Gaussian bell curves accordingly.
- the learning error values e2 filtered using the second filter 9 are supplied to a training means 11, which trains the second model 7, in particular varying its weightings of harmonic basis or activation functions accordingly.
- the friction torques determined by the first model and the cogging torques determined by the second model are added, since they are also additively superimposed in the drive trains.
- the control and/or monitoring means 3 receives corresponding values for the resistances in the drive trains from the model means 5, which this determines using the calibrated first model 6 and the calibrated second model 7 on the basis of the current machine state values w, and controls or monitors the Robot 1 on the basis of these model-based determined resistances, for example by the non-linear effects of friction and drive torque ripple at least partially compensated and thereby improves the operation, in particular the system dynamics, in particular with regard to stability, robustness and/or control quality.
- optimization methods such as the gradient descent method or a recursive least squares algorithm can be used to adapt the (parameter) weighting.
- the invention is used for the simultaneous identification or calibration and compensation of non-linear friction and non-linear moment ripples on the basis of a learning error while the robot is working.
- the deviation between the model-based calculated engine torque and the controller setpoint torque is used as the learning error.
- the basis for the identification or calibration is the use of function approximators. These are structured as follows in the exemplary embodiment:
- a predetermined number of basis or activation functions is distributed over the input space and weighted with parameters.
- the course of the approximated function then results from the addition of all weighted basis functions.
- Gaussian bell curves For friction, it makes sense to use Gaussian bell curves as the basis or activation function and to distribute them over the relevant speed range.
- both nonlinearities generate nonlinear moments and affect the learning error. It is therefore generally proposed to filter the learning error in a suitable manner before it is used to adapt the weights. Since in this case the frequency of the torque ripple depends on the engine speed w, the learning error is filtered using an adaptive notch filter with the transfer function G1(s,co). The notch frequency is adapted depending on the engine speed. As a result, the influence of the non-linear torque ripple is suppressed and the notch-filtered learning error results only from the influence of the non-linear friction.
- the weights of the General Regression Neural Network can thus be correctly adapted on the basis of the notch-filtered learning error, so that ultimately the friction can be correctly identified or modeled or the model can be calibrated or machine-learned.
- the weights of the Harmonically Activated Neural Network (HANN) can be correctly adapted so that the amplitude and phase of the ripples are correctly identified and the model is calibrated or machine-learned.
- HANN Harmonically Activated Neural Network
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mechanical Engineering (AREA)
- Robotics (AREA)
- General Physics & Mathematics (AREA)
- Artificial Intelligence (AREA)
- Software Systems (AREA)
- Evolutionary Computation (AREA)
- Mathematical Physics (AREA)
- Automation & Control Theory (AREA)
- Biophysics (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- Data Mining & Analysis (AREA)
- Computational Linguistics (AREA)
- Biomedical Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Fuzzy Systems (AREA)
- Feedback Control In General (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021204935.4A DE102021204935A1 (de) | 2021-05-17 | 2021-05-17 | Verfahren und System zum Betreiben einer Maschine |
| PCT/EP2022/057297 WO2022242929A1 (de) | 2021-05-17 | 2022-03-21 | Verfahren und system zum betreiben einer maschine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4341051A1 true EP4341051A1 (de) | 2024-03-27 |
Family
ID=81325943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22717106.3A Pending EP4341051A1 (de) | 2021-05-17 | 2022-03-21 | Verfahren und system zum betreiben einer maschine |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20240253218A1 (de) |
| EP (1) | EP4341051A1 (de) |
| KR (1) | KR20240009988A (de) |
| CN (1) | CN117320852A (de) |
| DE (1) | DE102021204935A1 (de) |
| WO (1) | WO2022242929A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116352704A (zh) * | 2023-02-17 | 2023-06-30 | 派特纳(上海)机器人科技有限公司 | 自主移动机器人的控制系统 |
| CN118721190B (zh) * | 2024-06-21 | 2025-02-28 | 山东大学 | 一种基于确定学习和知识融合的机械臂控制方法及系统 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6922025B2 (en) | 2002-02-21 | 2005-07-26 | Anorad Corporation | Zero ripple linear motor system |
| DE102009059137A1 (de) * | 2009-12-19 | 2010-07-29 | Daimler Ag | Diagnoseverfahren zur bordseitigen Bestimmung eines Verschleißzustandes |
| KR20150091346A (ko) | 2012-11-30 | 2015-08-10 | 어플라이드 머티어리얼스, 인코포레이티드 | 진동-제어되는 기판 핸들링 로봇, 시스템들, 및 방법들 |
| US11774944B2 (en) * | 2016-05-09 | 2023-10-03 | Strong Force Iot Portfolio 2016, Llc | Methods and systems for the industrial internet of things |
| US20210157312A1 (en) * | 2016-05-09 | 2021-05-27 | Strong Force Iot Portfolio 2016, Llc | Intelligent vibration digital twin systems and methods for industrial environments |
| US20200133254A1 (en) * | 2018-05-07 | 2020-04-30 | Strong Force Iot Portfolio 2016, Llc | Methods and systems for data collection, learning, and streaming of machine signals for part identification and operating characteristics determination using the industrial internet of things |
| JP2021049597A (ja) * | 2019-09-24 | 2021-04-01 | ソニー株式会社 | 情報処理装置、情報処理システム及び情報処理方法 |
-
2021
- 2021-05-17 DE DE102021204935.4A patent/DE102021204935A1/de active Pending
-
2022
- 2022-03-21 WO PCT/EP2022/057297 patent/WO2022242929A1/de not_active Ceased
- 2022-03-21 CN CN202280035579.8A patent/CN117320852A/zh active Pending
- 2022-03-21 US US18/561,182 patent/US20240253218A1/en active Pending
- 2022-03-21 KR KR1020237043288A patent/KR20240009988A/ko active Pending
- 2022-03-21 EP EP22717106.3A patent/EP4341051A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022242929A1 (de) | 2022-11-24 |
| DE102021204935A1 (de) | 2022-11-17 |
| KR20240009988A (ko) | 2024-01-23 |
| CN117320852A (zh) | 2023-12-29 |
| US20240253218A1 (en) | 2024-08-01 |
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