Symbio 700 wiring. Odyssey with Symbio 700 - Field Wiring Pairing Instructions Assi...

Wiring Diagrams Note: Wiring diagrams can be accessed

The Symbio 700 controller provides a 2 X 16 backlit LCD display on the middle of the controller. The onboard user interface includes a Bluetooth pair button to pair with the Symbio 700 controller for use with the Symbio Service and Installation mobile app. Figure 29. User interface keypad. Table 1. Firmware download page. Notes: The preferred method for upgrading the firmware, restoring a controller backup, and configuring the Symbio 700 controller is by using the Symbio …Packaged Rooftop Air Conditioners with Symbio™ 700 Controls 27.5 to 50 Tons - 60 Hz 22.9 to 41.7 Tons (82-142 kW) - 50 Hz “C” and later design sequence 60Hz/3 phase: TC*, TE*, YC*, 330C, 360C, ... Proper Field Wiring and Grounding Required! Failure to follow code could result in death or serious injury.The same number is shown on the display of the Symbio 700 controller until the pairing is complete, allowing the user to confirm connection to the intended controller. BAS-SVU054B-EN 9 Symbio Service and Installation Mobile Application Figure 5. Bluetooth pairing 9. Press on the Symbio 700 on-board keyboard/display to complete the pairing.The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use. ACC-SVP001B-EN_11122020.pdf. 800 KB Download. LCU Symbio 700 Bacnet Intergation Guide *Please refer to the latest available literature when available.*.To download the Symbio Service & Installation mobile app: 1. Navigate to the Apple App Store or Google Play Store on your mobile device. 2. Search for Trane Symbio to locate the Symbio Service & Installation app. 3. Download and install the app.Symbio™ 210 Programmable Variable-Air-Volume (VAV) Box Controller September 2022 BAS-SVX084C-EN Installation, Operation, and Maintenance ... All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow …Symbio 700 Advanced vs Basic Versions. The Symbio 700 is available in 2 versions to meet the diverse applications that this controller will be used for. The Basic Version is typically used in a setting where a thermostat is involved. The Advanced Version is typically used in a setting where a BAS system is involved, or if field programming is ...Starting in late 2020, Trane Odyssey split systems are now provided with Tracer Symbio 700 controllers and accessories. Trane Odyssey units with Symbio 700 controls are compatible with Tracer Concierge and other Trane controls systems. Trane Odyssey units with Symbio 700 controls can also be connected to other control systems via BACnet or ...Symbio™ Wiring Connections: Using the supplied harness connect PPF87 to the actuator connector. Route harness to fresh air options module located in the return section and connect to FAOM-J11. After installation is complete, Symbio™ 700 UC unit configurationJump to Symbio Communication Wire Article WARNING: Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or …Brief overview of the Symbio 700 app and setting up common parameters.Symbio 700 wired as a straight cool with electric heat using only two conductors between the condenser and air handler. Symbio 700 Thermostat J21 Terminals Thermostats. Customers occasionally require operation with a conventional thermostat rather than a zone sensor. Non-Trane building controllers typically provide an interface to HVAC equipment based on a conventional thermostat interface. The Symbio™ 700 controller rotary address sets the BACnet® MS/TP MAC address. Each BACnet® MS/TP device on the same MS/TP link must have a unique MAC address. The valid range of BACnet® MS/TP MAC addresses for the Symbio™ 700 is 001–127. Changing the rotary address will immediately take effect and does NOT require a power cycle to theSymbio 800 Power Supply Requirements Power the Symbio 800 controller as follows: The PM014 power supply module, throu gh inter-module-communcai tion, is the preferred method of powering the Symbio 800 controller. † PM014 Output: 1.4 A max at 24 VDC at 70°C. Refer to the PM014 Power Supply IOM (BAS-SVX33-EN).Note: If a Symbio 700 is not the original Symbio controller as shipped with the equipment, the Bluetooth equipment list will list the controller serial number, instead of the equipment serial number. 8. When prompted, pair the app to the Symbio 700 controller. A popup message displays a 6-digit random number. The same number is shownWiring Diagrams Note: Wiring diagrams can be accessed using e-Library by number search field or by contacting technical entering the diagram number in the literature order support. ... Wiring diagrams (continued) Drawing Schematic Type Voltage Description Controls Number Symbio 700 LABEL; FUSE TABLE Main Unit X39004322 Component …Jun 4, 2021 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ... The option module operates with the Symbio™700 in the condenser to provide electric heat logic control. FunctionorDescription Table1. Specifications OperatingTemperatureRange -40to70°C(24Vac) ... Using the wire ties provided, bundle and dress any excess wire away from sharp edges. 7. Reinstall the …Connecting to the Symbio 700 Controller. 1. ... is a short-range wireless communication technology that allows electronic devices to communicate without the need for wires or cables. The Symbio 700 controller uses Bluetooth to communicate with the Symbio Service and Installation Mobile App for initial startup and … Control Unit Trane Symbio 700 FIAOPTN001 Series Installation Manual. Fresh air options module (8 pages) Control Unit Trane XL824 User Manual. Programmable control with a color touch-screen (32 pages) Control Unit Trane ADAPTIVE CONTROL UCM-CLD Installation Operation & Maintenance. Operating and control principles (28 pages) Symbio™ ™ 700 unit controller wiring Symbio 700 Unit Controller 4 10 11... Page 28 I I n n s s t t a a l l l l a a t t i i o o n n Pairing B: Symbio Heat Pump with SZVAV / 1. Zone control (see Figure 15, p. 2-Speed Air ... Service Test Mode The Symbio™ 700 supports a Service Test Mode that energize the appropriate outputs.Overview: Symbio 700 2023 DOE Standard B VFD Programming Parameters. See the Attached PDF below. WARNING: Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or …Wiring and Setup: Symbio Condenser or Heat Pump with SZVAV / 2 Speed Air Handler Step 1: Wire the Thermostat or Zone Sensor Wire Zone Sensor to J19 or Thermostat to J21 on the Symbio 700 UC in the outdoor unit.To wire a Smoke Detector or other shutdown device to the Symbio unit use the J18 terminals on the Symbio 700 UC. Customer Connection Polarity: The contacts are default normally open (closure between J18-1 and 2 will shut the unit down)Odyssey with Symbio 700 - Field Wiring Pairing Instructions Assistance; Interconnecting Wire Info (other than communication wire) Interconnecting wiring for Legacy Electromechanical Condenser with Symbio CV Air Handler (Pairing 3) Interconnecting wiring for Legacy Reliatel Condenser (Cooling or Heat Pump) with Symbio CV Air …Download the Manual. Trane Symbio 700 Wiring Diagram. Need a wiring diagram for your Trane Symbio 700? Download it here. Download the Wiring Diagram. …SSA-SVX06L-EN 5 Model Number Description Air Handler Digit 1, 2, 3 — Unit Function TWE = Air Handler Digit 4, 5, 6— Tonnage 051 = 4.6 Tons (50Hz) 060 = 5 Tons (60 Hz)Wiring Diagrams Note: Wiring diagrams can be accessed using e-Library by number search field or by contacting technical entering the diagram number in the literature order support. Table 9. Wiring diagrams Drawing Schematic Type Voltage Description Controls Number SCHEMATIC; SHEET 1, POWER, DUAL …To download the Symbio Service & Installation mobile app: 1. Navigate to the Apple App Store or Google Play Store on your mobile device. 2. Search for Trane Symbio to locate the Symbio Service & Installation app. 3. Download and install the app.June 27, 2022. Trane is releasing a new generation of Precedent rooftop units to meet the next era of energy efficiency requirements. The new Precedent portfolio will include capacities from 3-25 tons, a full range of tonnages and heating types, and improved efficiency levels. The new single-product family of light commercial unitary rooftops ...Installation manual. Trane Symbio 700 Installation Manual. Options module used with odyssey split systems constant volume air handlers (digit 15-1) Also See for Symbio 700: …Step #1 Wiring Errors. The space pressure transducer connects to the Space Pressure / TRAQ LLID (6KF16) J2-2 (5 VDC), J2-3 (common) and J2-4 (signal from transducer). Verify that the wiring is correct, all the plugs are connected, and the voltages are present at the transducer. Refer to the unit schematics for wire numbers.Symbio® 700 - What options module is needed with what options and address of each module; Accessory - Drain Pan Overflow Switch February 29, 2024 21:30; Updated; Accessory ... Wiring: Connect PPF121 from the factory-installed harness to the connector on the switch pigtail.The purpose of this document is to provide instructions for integrating the Symbio™ 700 controller into building automation systems. This document is targeted to system integrators and controls contractors. Symbio™ 700 Controller Overview The Symbio™ 700 controller has been installed, programmed, wired, commissioned, …Coax or coaxial cable is familiar to most people as the wire that you use to connect cable to your television. While it is most commonly used for video applications, it is amazing...Factory-mounted Symbio 800 unit controllers on chillers or IntelliPak rooftop units support a maximum of 120 points. The LLID points do not count towards the 120 point maximum. Factory-mounted Symbio 800 controllers on Climate Changer air handlers support the Symbio Options Module on the IMC link in addition to the XM modules.Condenser LTB1-EF to Air Handler Relay Board J5-4. Condenser LTB1-H1 to Air Handler Relay Board J5-7 - Electric Heat. Condenser LTB1-H2 to Air Handler Relay Board J5-8 - Electric Heat. EDC Switch - Optional. Condenser LTB2-CD to Air Handler Relay Board J5-1. Move wire from terminal “H” to terminal “L” on EDC switch, enabling normally ... Odyssey with Symbio 700 - Field Wiring Pairing Instructions Assistance; Interconnecting Wire Info (other than communication wire) Interconnecting wiring for Legacy Electromechanical Condenser with Symbio CV Air Handler (Pairing 3) Interconnecting wiring for Legacy Reliatel Condenser (Cooling or Heat Pump) with Symbio CV Air Handler (Pairing 4) Neither Pinky nor her classmates are taking this lying down. They have been protesting for over two months now. Pinky Bhan, 14, is the first woman in her family to go to school. He...Symbio FIAOPTN002 700 Indoor Options Module Installation Guide Introduction. Read this manual thoroughly before operating or servicing this unit. SAFETY WARNING. Only qualified personnel should install and service the equipment. ... All field wiring MUST be performed by qualified personnel.Symbio 700 Controller. SAFETY WARNING. Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, …Firmware download page. Notes: The preferred method for upgrading the firmware, restoring a controller backup, and configuring the Symbio 700 controller is by using the Symbio … To configure the Symbio 700 without the app follow these steps. Push the. 1) Home button to in sure you start from the beginning. Push the. 2) Down button till the display shows Utilities. 3) Push the Enter button. 4) Push the down button till the display shows Unit Config. 5) Push the Enter button. This guide provides details relating to Precedent units with Symbio 700 unit controls and the feature dependencies on additional control modules or sensors. This document is maintained by the ... Colored and Numbered Wiring X 6-25T, all models Crankcase Heaters X 6-25T, all models Humidity Control (HGRH ) ** X 6 ... Controller Trane Symbio 700 User Manual. (20 pages) Control Unit Trane Symbio 700 Installation Manual. Options module used with odyssey split systems constant volume air handlers (digit 15-1) (8 pages) Controller Trane Symbio 700 Firmware Update. (6 pages) Controller Trane Symbio 210 Installation, Operation And Maintenance Manual. Odyssey with Symbio 700 - Field Wiring Pairing Instructions Assistance; Interconnecting Wire Info (other than communication wire) Interconnecting wiring for Legacy Electromechanical Condenser with Symbio CV Air Handler (Pairing 3) Interconnecting wiring for Legacy Reliatel Condenser (Cooling or Heat Pump) with Symbio CV Air …According to Remington’s website, the value of a Remington 700 BDL .30-06 begins at $994.00 as of May 2014. This is the manufacturer’s suggested retail price for the rifle. The Rem...Related articles. Odyssey Symbio 700 Troubleshooting Manual; Wiring a Symbio Condenser to a Generic 24 VAC Controlled Air Handler; Interconnecting wiring for Symbio Condenser (Cooling Only) with Legacy 2 Speed Electromechanical Air Handler (Pairing 2)Legacy Software Downloads. NOTICE: Older versions of Trane legacy software controls products are not maintained and are not updated with the latest security or other update patches. Customer must maintain their own cybersecurity protocols. For more information, click HERE. Trane employees may download this software for their use, but …Step #2 Excessive Noise on Comm Link. Electrical noise from Variable Frequency Drives (VFDs) or unit high voltage wiring can cause communication problems. Turn power off to the unit. Separate the comm link wires from high voltage power wiring (especially VFD wiring) as much as possible. Restore power to unit. The zone sensors that are compatible with the Symbio 700 are. BAYSENS108. BAYSENS077. BAYSENS135. BAYSENS135-Connections-to-a-Symbio-700. BAYSENS800 Only the advance Symbio board is capable of using this sensor. Connecting-a-BAYSENS800-to-an-Odyssey-Symbio-700-Controller. Symbio 700 Precedent [LCU] Bacnet/Modbus [LCU] LCU Precedent Symbio 700 BACnet/Modbus Integration Guide. 1 month ago. Updated. Attached is the integration … Symbio 700 Overview Field Connection The Symbio™ 700 controller optimizes inputs and outputs (I/O) for multiple applications. For initial installation of a Voyager 3 with Symbio 700, the field landed inputs are outlined below. Figure 1. Symbio 700 field connections Table 1. Field Connections Connector Function Pin # Signal J16 Demand Shed ... Symbio 700 Thermostat J21 Terminals Thermostats. Customers occasionally require operation with a conventional thermostat rather than a zone sensor. Non-Trane building controllers typically provide an interface to HVAC equipment based on a conventional thermostat interface. Firmware download page. Notes: The preferred method for upgrading the firmware, restoring a controller backup, and configuring the Symbio 700 controller is by using the Symbio …After two flights and hours of listening, here are my impressions as a traveler as I review the Bose 700 headphones. I was a convert to the Apple AirPods. I used to have a pair of ...You've ripped a movie on your laptop, and now want it on that fancy new home theater PC next to your TV. If you've got the time, wiring your house with Cat-5e cable could make tran...Wire the thermostat to the Symbio 700 J21 except for R and C, wire thermostat R to Symbio Adapter Board J15-1, wire thermostat C to Symbio Adapter Board J15-2. Note: …Symbio™ ™ 700 unit controller wiring Symbio 700 Unit Controller 4 10 11... Page 28 I I n n s s t t a a l l l l a a t t i i o o n n Pairing B: Symbio Heat Pump with SZVAV / 1. Zone control (see Figure 15, p. 2-Speed Air ... Service Test Mode The Symbio™ 700 supports a Service Test Mode that energize the appropriate outputs.Odyssey with Symbio 700 - Field Wiring Pairing Instructions Assistance; Interconnecting Wire Info (other than communication wire) Interconnecting wiring for Legacy Electromechanical Condenser with Symbio CV Air Handler (Pairing 3) Interconnecting wiring for Legacy Reliatel Condenser (Cooling or Heat Pump) with Symbio CV Air …Feb 29, 2024 · Download Symbio 700 Mobile Phone App. 1. Navigate to the Apple App Store or Google Play Store on your mobile device. 2. Search for Trane Symbio to locate the Symbio Service & Installation app. 3. Download and install the app. • Updated Field Wiring section in Installation chapter. • Updated Symbio Controls section in Installation chapter. • Updated Low Voltage Wiring section in Installation chapter. • Updated Wiring Diagram Matrix and Device Location chapter. IInnttrroodduuccttiioonnThis guide provides details relating to Precedent units with Symbio 700 unit controls and the feature dependencies on additional control modules or sensors. This document is maintained by the Precedent™ Product Support Team. ... Colored and Numbered Wiring X 6-25T, all models Crankcase Heaters X 6-25T, all models Humidity Control (HGRH) ** X ...Factory-mounted Symbio 800 unit controllers on chillers or IntelliPak rooftop units support a maximum of 120 points. The LLID points do not count towards the 120 point maximum. Factory-mounted Symbio 800 controllers on Climate Changer air handlers support the Symbio Options Module on the IMC link in addition to the XM modules.coded wiring with keyed connectors that minimize wiring mistakes to our Symbio® Service and Installation app that provides guided start-up tasks. Now with even more advantages! Precedent with Symbio 700 now includes more of the features and support you need to make it your preferred unit.Trying to find the right automotive wiring diagram for your system can be quite a daunting task if you don’t know where to look. Luckily, there are some places that may have just w... The Symbio™ 700 controller rotary address sets the BACnet® MS/TP MAC address. Each BACnet® MS/TP device on the same MS/TP link must have a unique MAC address. The valid range of BACnet® MS/TP MAC addresses for the Symbio™ 700 is 001–127. Changing the rotary address will immediately take effect and does NOT require a power cycle to the Overview: Symbio 700 2023 DOE Standard B VFD Programming Parameters. See the Attached PDF below. WARNING: Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or ... Odyssey units are capable of integrating into building automation and control systems for optimization, monitoring and data analysis. New models are equipped with the Symbio® 700 controller for improved usability and automated optimization. Symbio's intuitive user interface displays system alarms, diagnostics and resolutions. This guide provides details relating to Precedent units with Symbio 700 unit controls and the feature dependencies on additional control modules or sensors. This document is maintained by the ... Colored and Numbered Wiring X 6-25T, all models Crankcase Heaters X 6-25T, all models Humidity Control (HGRH ) ** X 6 ...Before the drywall can be installed, all the plumbing and wiring in the walls must be run. Everything from electrical and phone lines to cable and speaker wires need to be roughed ...factory-supplied ground wire must be connected from any chassis ground connection on the device to an appropriate earth ground. Symbio 800 Power Supply Requirements Power the Symbio 800 controller as follows: The PM014 power supply module, throu gh inter-module-communcai tion, is the preferred method of powering the Symbio 800 controller.Communication Wire Info. Note: If you have a Symbio Condenser paired with a Symbio Air Handler with Model Number Digit 15 = D (2 Stage Airflow/Single Zone VAV) you must run BOTH Adapter Board J15-3 & 4 to Relay Board J4-3 & 4 and Adapter Board J16-1 & 2 to Relay Board J7-1 & 2 shielded twisted pair! Use the …To do this, disconnect the wires on the Symbio 210 controller on terminals Ground AI2 and measure the Vdc– it should be 2.6–3.0 Vdc. If there is 2.6–3.0 Vdc at the Symbio 210 controller, the wires going to the zone are OPEN. If 2.6–3.0 Vdc is not present, check the incoming power to the Symbio 210 controller on XFMR 24 Vac …Download Symbio 700 Mobile Phone App. To download the Symbio Service & Installation mobile app: 1. Navigate to the Apple App Store or Google Play Store on your mobile device. 2. Search for Trane Symbio to locate the Symbio Service & Installation app. 3. Download and install the app. WARNING: Information in this article is intended for use by ...Proper Field Wiring and Grounding Required! Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified ... • Updated for new Symbio™ 700 controls. • Updates to dimensional data. • Running changes included. Introduction. 4 SSA-SVX06J-ENOdyssey Symbio 700 - Start Up Log Click the link below WARNING: Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air …Wiring Diagrams Note: Wiring diagrams can be accessed using e-Library by number search field or by contacting technical entering the diagram number in the literature order support. Table 9. Wiring diagrams Drawing Schematic Type Voltage Description Controls Number SCHEMATIC; SHEET 1, POWER, DUAL …SSA-SVX06L-EN 5 Model Number Description Air Handler Digit 1, 2, 3 — Unit Function TWE = Air Handler Digit 4, 5, 6— Tonnage 051 = 4.6 Tons (50Hz) 060 = 5 Tons (60 Hz) BAS-SVN043A-EN_06102020.pdf. 600 KB Download. Odyssey Symbio 700 Troubleshooting Manual. Odyssey Symbio 700 Control Board Application Guide. Odyssey Splits with Symbio 700 Controls. Interconnecting wiring for Symbio Condenser (Cooling or Heat Pump) with Legacy CV Air Handler (Pairing 1) Odyssey Symbio 700 UC LED 9 & 10. Overview: See below for ... Proper Field Wiring and Grounding Required! Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified ... • Updated for new Symbio™ 700 controls. • Updates to dimensional data. • Running changes included. Introduction. 4 SSA-SVX06J-ENThe same number is shown on the display of the Symbio 700 controller until the pairing is complete, allowing the user to confirm connection to the intended controller. BAS-SVU054B-EN 9 Symbio Service and Installation Mobile Application Figure 5. Bluetooth pairing 9. Press on the Symbio 700 on-board keyboard/display to complete the pairing.Trane Symbio 700 Manual. Need to keep your Trane Symbio 700 Controller in good working condition but don’t know where to start? Directly from the manufacturer, this downloadable resource has all the information you need. The following resources apply to the Trane Symbio 700 Controller only. Check back …Open the access panel to gain access to the left side of the main unit control box. Install the options module and secure the board with four screws (provided in kit) (see Figure 2, p. 5). Ensure P5 connector is orientated to the top right position. On the options module, set the address rotary switches to 75.Factory-mounted Symbio 800 unit controllers on chillers or IntelliPak rooftop units support a maximum of 120 points. The LLID points do not count towards the 120 point maximum. Factory-mounted Symbio 800 controllers on Climate Changer air handlers support the Symbio Options Module on the IMC link in addition to the XM modules.The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use. ACC-SVP001B-EN_11122020.pdf. 800 KB Download. LCU Symbio 700 Bacnet Intergation Guide *Please refer to the latest available literature when available.*.This document was created to help the field with Odyssey field wiring for Trane Symbio 700, Trane Legacy, and non-Trane Scenarios. Each pairing is identified with a specific designation (see slide 2 of attached doc). Depending on the pairing designation, the wiring between the condenser, air handler, and thermostat / …Feb 29, 2024 · Download Symbio 700 Mobile Phone App. 1. Navigate to the Apple App Store or Google Play Store on your mobile device. 2. Search for Trane Symbio to locate the Symbio Service & Installation app. 3. Download and install the app. On the Indoor Options module, when the module is field-installed set the address rotary switches to 75. This is required to integrate the options module with the Symbio controller. If the Indoor Options module was powered up before setting the address, reset the IMC link. To reset the IMC link go to Tools < Service < scroll down to IMC LINK RESET. Proper Field Wiring and Grounding Required! Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified ... • Updated for new Symbio™ 700 controls. • Updates to dimensional data. • Running changes included. Introduction. 4 SSA-SVX06J-EN Ready for the new era of connected buildings. Precedent units are capable of integrating into building automation and control systems for optimization, monitoring and data analysis. New models are equipped with the Symbio® 700 controller for improved usability, automated optimization. New digital benefits: . 10 and 20 ton dual circuit Odyssey condensers equipped with SSymbio 700 U60 Lontalk Module xif Program Id 80002A5500030420 att Note: If a Symbio 700 is not the original Symbio controller as shipped with the equipment, the Bluetooth equipment list will list the controller serial number, instead of the equipment serial number. 8. When prompted, pair the app to the Symbio 700 controller. A popup message displays a 6-digit random number. The same number is shown Traveling to a casino and uneasy about carryi How to add a WCI to a Symbio 700. The Symbio 700 advanced controller supports BACnet Zigbee (Air-Fi) communication protocol. A Wireless Communicating Interface (WCI) must be added to the for Symbio 700 for Air-Fi to work. Below are the best options available when connecting a WCI to a Symbio 700. 1) Odyssey Indoor Unit Relay Board Traveling to a casino and uneasy about carrying a ...

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