REBEL LS

TERMINATED HARNESS
FOR NEXUS REBEL LS ECU

QUICK START GUIDE

HT-186500

9 356450 01393 2
HARNESS OVERVIEW
GENERAL INSTALLATION WARNING: What’s in the bag?
A Nexus series ECU or VCU allows connection
• .Nexus Rebel LS terminated harness (HT-186500)
to your laptop via the Nexus Software
Programmer (NSP) using the included USB • Pack of connectors and pins set to .terminate to spare inputs and outputs
Congratulations on purchasing a Nexus Rebel cable, without the need for +12V power. This • 2 and 4 pin alternator adapter harnesses
LS terminated wiring harness! This specialized feature conveniently lets you set up your
harness is intended for seamless integration with ignition, injector, and various other outputs
a Nexus Rebel LS Engine Control Unit (ECU), and before initially powering up the control unit
is compatible with GM LS engines featuring either using this harness. Turning on the control
Gen III cable throttle or Gen IV Drive By Wire (DBW) unit with incorrect configurations can lead to
throttle systems. damage to both the engine and control unit
In conjunction with a Nexus Rebel LS ECU, your Gen components.
III or Gen IV GM LS engine will have an extensive This wiring harness is not designed to provide
range of performance and tuning capabilities. grounding for your engine. Ensure your engine
This Quick Start Guide will walk you through the is adequately grounded using a grounding or
installation of this terminated harness along with earthing strap to connect your engine to the
the options of adding sub-harnesses and other battery.
devices. Avoid creating sparks or using electrical
devices near flammable substances. Always
Harness Features: disconnect the battery cables when working
Nexus Rebel LS ECU connectors on the electrical systems of your vehicle. Make
sure all fuel system components and wiring
Terminated connections for both the engine bay and
are installed away from heat sources, properly
cabin
shielded if necessary, and in well-ventilated
Connection to Haltech CAN devices (e.g., dash areas.
displays, keypads, etc.)
After installation, double-check for any fuel
Connection to sensors (e.g., crank, cam, MAP, leaks and ensure that no wiring is left exposed
temperature, fluid pressure, position, speed, etc.) or uninsulated to avoid the risk of a fire from a
Bosch LSU 4.9 wideband lambda sensor control spark or short circuit.
Available adapters and sub-harnesses (sold separately)
Two Gen IV style knock sensor connectors Do not charge or disconnect the battery while Injector sub-harness:
Direct connection to the OEM ignition sub-harness the engine is running. Doing so could expose HT-186501 - Nexus Rebel LS - EV1 injector sub-harness
Connection to 8x injectors (refer to sub-harness the control unit to an unregulated power
HT-186502 - Nexus Rebel LS - EV6 injector sub-harness
options) supply, which might lead to control unit failure.
HT-186503 - Nexus Rebel LS - Multec 2 injector sub-harness
Connections for thermofan and fuel pump control
Throttle / Pedal adapters:
Compatibility with DBW or Cable throttle systems
(refer to adapter options) HT-186505 - Nexus Rebel LS - 6-pin DBW adapter harness

Connection for alternator control HT-186506 - Nexus Rebel LS - 8-pin DBW adapter harness
Connection for transmission wiring HT-186512 - Nexus Rebel LS - Bosch pedal adapter harness
Spare high current output (25A) HT-186507 - Nexus Rebel LS - Corvette pedal adapter harness
Spare inputs and outputs HT-186504 - Nexus Rebel LS - TPS + IAC sub-harness
Transmission sub-harness:
HT-187003 - Nexus Rebel LS - T56 transmission sub-harness
Sensor adapters:
HT-186510 - Nexus Rebel LS - Gen IV Oil pressure sensor adapter harness
HT-186511 - Nexus Rebel LS - MAP sensor adapter harness
HT-186508 - Nexus Rebel LS - Gen III Knock sensor sub-harness

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HARNESS PINOUT DIAGRAM CONNECTOR C (KEYWAY TYPE 2)
Pin Function Color Connector A Connector C
C1 Crank Yellow
C2 Unused Unused
CONNECTOR A (KEYWAY TYPE 1)
C3 Cam Yellow
Pin Function Color
C4 Unused Unused
A1 Injector 1 Blue C5 Inputs / SPI 1 Gray/Brown
A2 Injector 2 Blue/Black C6 Inputs / SPI 2 Gray/Red 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
A3 Injector 3 Blue/Brown C7 Inputs / SPI 3 Gray/Orange 10 11 12 13 14 15 16 17 10 11 12 13 14 15 16 17
A4 Injector 4 Blue/Red C8 Inputs / SPI 4 Gray/Yellow 18 19 20 21 22 23 24 25 18 19 20 21 22 23 24 25

A5 Injector 5 Blue/Orange C9 Crank / Cam Supply Orange/White 26 27 28 29 30 31 32 33 34 26 27 28 29 30 31 32 33 34

A6 Injector 6 Blue/Yellow C10 Inputs / AVI 1 White

C11 Inputs / AVI 2 White/Yellow
A7 Injector 7 Blue/Green
C12 Fuel pressure White/Gray
A8 Injector 8 Blue/Violet
C13 Oil pressure White/Violet
A9 Outputs / DPO 1 Violet/Black
C14 MAP White/Green
A10 Power Ground Output Black
C15 Throttle TPS 1 White/Orange
A11 Power Ground Output Black C16 Throttle TPS 2 White/Black
A12 Outputs / DPO 2 Violet/Brown C17 APP 1 White/Brown
A13 Ignition Switch Input Pink C18 APP 2 White/Red
A14 Outputs / DPO 3 Violet/Red C19 Transmission Gray/Pink
A15 Outputs / DPO 4 Violet/Orange C20 Transmission / VSS Gray/L.Green
A16 Outputs / DPO 5 Violet/Yellow C21 Unused Unused

A17 Tacho Output Violet/Green C22 Unused Unused

C23 Knock Odd Black/Blue
A18 Transmission Supply Pink/Red
C24 Knock Even Black/Green
A19 Throttle / IAC 1 Brown/Black
C25 +5V Sensor Supply Orange
A20 Throttle / IAC 2 Brown/Red
C26 Sensor Ground Black/White
A21 Throttle / IAC 3 Brown/Green
C27 Coolant temperature L.Green
A22 Throttle / IAC 4 Brown/Pink C28 Air temperature L.Green/Black
A23 CAN H White C29 WBI 1 Heater + Gray
A24 CAN L Blue C30 WBI 1 Input Yellow
A25 CAN Supply Pink/Brown C31 WBI 1 Pump Red
A26 Unused Unused C32 WBI 1 Nernst Black 4 1
A27 Ignition 1 Yellow/Black C33 WBI 1 Heater - White

A28 Ignition 2 Yellow/Red

C34 WBI 1 Cal Green 3 2
A29 Ignition 3 Yellow/Orange
CONNECTOR E
A30 Ignition 4 Yellow/Green
Pin Function Color
A31 Ignition 5 Yellow/Brown
E1 AX25+ (Auxiliary 25A) Red/Blue
A32 Ignition 6 Yellow/Blue
A33 Ignition 7 Yellow/Violet
E2
E3
Fuel Pump
Fan
Red/Yellow
Red/Orange
Connector E
A34 Ignition 8 Yellow/Gray E4 Inj/Ign Supply Red/Green

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NEXUS REBEL LS CONNECTIONS Nexus Rebel LS ECU Connection Alternator
With the unit powered off, connect the 3 ECU plugs (Label: Alt)
Pink / Brown wire
on the main harness to the Nexus Rebel LS ECU. This harness is equipped with a DTM-2 plug to
provide switched +12V power to alternators with
built-in regulators. Additionally, the harness
Alternator
Connector A: includes alternator adapter harnesses suitable for
adapter
34-pin, Keyway Type 1 typical LS engine alternators with 2-pin Bosch or
harness
Connector C: Yazaki connectors, as well as those with 4-pin Delco

A C E 34-pin, Keyway Type 2

Connector E:
4-pin, DTP
connectors:
• HT-186123 LS 2-pin Bosch alternator adapter
1 2
Harness side

1 - Switched +12V
• HT-186124 LS 4-pin Delco alternator adapter
2 - Unused
• HT-186125 LS 2-pin Yazaki alternator adapter
Battery Positive and Battery Negative Using the adapter harnesses above excites the
(Nexus Rebel LS ECU) alternator using a 470-ohm inline resistor, serving
To battery
For correct operation, the battery positive and as a replacement for the charge indicator light.
battery negative must be connected to the Nexus
Rebel LS ECU at all times.
Connect the positive (+) terminal of the battery to HT-186123
the Nexus Rebel LS ECU’s positive (Red) terminal.
Use the supplied ring terminal and Red boot, along
with a Red 4AWG battery cable (sold separately) for HT-186125
the connection.
Connect the negative (-) terminal of the battery
to the Nexus Rebel LS ECU’s negative (Black) HT-186124
terminal. Use the supplied ring terminal and Black Ignition Switch
boot, along with a Black 4AWG battery cable (sold (Label: Ign Sw)
separately) for the connection.
The ignition switch input (pink) wire must be
connected to a switched +12V source to turn the Crankshaft and Camshaft Position Sensors Crank sensor wiring
Nexus Rebel LS ECU on. (Label: Crank, Cam)
The crank position sensor plug connects directly to Sensor power
When connecting this wire to the ignition key

CBA
Signal ground
switch, it is important to make sure to use the the engine’s crank angle sensor.
Signal
main ignition wire (i.e., not accessory) so it doesn’t The cam position sensor plug connects directly to
lose power when the key is in the “Start” position, the sensor. However, note that the wiring varies
causing the ECU to momentarily turn off. between models for the GM LS engines. Hence, Cam sensor wiring
The pink wire is the flying lead (unbraided) coming the plug has the signal wire (yellow) and sensor
out of the in-cabin inputs and outputs connector power wire (red) both unplugged, and is left for the Sensor power !

CBA
installer to “pin” into the connector to suit what the Signal ground
branch. Signal !
cam sensor requires.
Refer to the table below for the pinout and insert
the pins into the connector until they lock. ! Wires left unplugged will need to be pinned
Battery to suit the specific cam sensor used.
Accessory
- + Ignition
Start
CAM SENSOR PLUG PINOUT WIRING
PIN LS1 CAM SENSOR LS2/LS3 CAM SENSOR LS2/LS3 CAM (WIRING TO PIGTAIL HARNESS)
Ignition A Signal (Yellow) Sensor power (Red) Signal (Yellow)
Switch Input B Signal ground (Black) Signal ground (Black) Signal ground (Black)
C Sensor power (Red) Signal (Yellow) Sensor power (Red)

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INJECTORS AND IGNITION COILS Ignition Coil Breakout
(Label: IGN Odd, IGN Even)
This harness is designed to plug into the OEM
ignition sub-harness and therefore no ignition sub-
1 2 3 4 5 6 harness is supplied.
Fuel Injector Breakout
(Label: INJ) Ensure the correct ignition breakout connector is
12 11 10 9 8 7
This Rebel LS terminated harness uses an injector
connected to the corresponding ignition coil sub- H G F E
harness bank on the engine. Refer to the diagram
breakout connector to plug into multiple types of
injector sub-harnesses (sold separately). The choice
below to identify the odd and even banks on a GM A B C
Main harness side view LS engine.
of sub-harness will depend on the type of injector
The harness also has two 13mm ignition coil ground Ignition coil breakout connector
connectors that are used.
ring terminals that will need to be bolted onto each (Main harness side view)
Each injector plug is labeled accordingly to easily FUEL INJECTOR BREAKOUT CONNECTOR
of the engine heads to provide ground to the coils.
identify which injector on the engine it connects PIN FUNCTION COLOR
to. Refer to the diagram on page 9 for LS engine NOTE: The factory LS ignition coils come with
1 Injector 1 Blue
cylinder number identification. built in igniters. Should you choose to switch to a
2 Injector 2 Blue/Black
different kind of ignition coil, it’s crucial to confirm
NOTE: The Nexus Rebel LS ECU only supports high 3 Injector 3 Blue/Brown Ignition ground ring terminal
that the new coils also have built-in igniters
impedance injectors.
4 Injector 4 Blue/Red prior to connecting them to the ignition breakout
connectors. Using ignition coils that do not have
5 Injector 5 Blue/Orange
igniters built-in will cause harm to the ECU.
6 Injector 6 Blue/Yellow
7 Injector 7 Blue/Green IGNITION COIL BREAKOUT CONNECTOR
8 Injector 8 Blue/Violet IGNITION ODD IGNITION EVEN
9 Injector supply Red/Green PIN FUNCTION COLOR PIN FUNCTION COLOR
10 Injector supply Red/Green A Ground Black A Ground Black
11 Injector supply Red/Green B Ignition 7 Yellow/Violet B Ignition 2 Yellow/Red
12 Injector supply Red/Green C Ignition 5 Yellow/Brown C Ignition 4 Yellow/Green
D Unused Unused D Unused Unused
E Ground Black E Ground Black
F Ignition 3 Yellow/Orange F Ignition 6 Yellow/Blue
G Ignition 1 Yellow/Black G Ignition 8 Yellow/Gray
HT-186501 - Nexus Rebel LS EV1 H Ignition supply Red/Green H Ignition supply Red/Green
injector sub-harness
Odd bank

7 5 3 1

Rear of engine Front of engine

8 6 4 2
Even bank
HT-186502 - Nexus Rebel LS EV6 HT-186503 - Nexus Rebel LS Multec 2
injector sub-harness injector sub-harness Cylinder numbers of a GM LS engine

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HARNESS CONNECTIONS Thermofan Control Fuel Pump Control
Oil and Fuel Pressure Sensors
(Label: Oil Press / Fuel Press) (Label: Fan) (Label: F.Pump)

This harness plugs directly into the factory oil This harness provides direct thermofan control The harness also provides direct fuel pump control
pressure sensor using the early style 3-pin using the Red/Orange 12AWG cable terminated using the Red/Yellow 12AWG cable terminated with
Manifold Absolute Pressure (MAP) Sensor with a butt splice connector. a butt splice connector.
(Label: MAP) connector shown below. If you are using a later
model Gen IV type of oil pressure sensor, a HT- Use this cable to supply +12V power directly Utilize this cable to supply +12V power directly to
The MAP sensor connector on the harness plugs 186510 Oil pressure adapter harness can be used. to the thermofan and leverage ECU functions, the fuel pump, allowing the ECU to prime the pump
into a Gen III style sensor as shown below. The harness also comes with an early style 3-pin such as setting the fan’s on/off temperature when the system is turned on and to implement
pressure sensor connector that is compatible with threshold, activating the fan with air-conditioning, safety functions, such as automatically turning the
If you are using a Gen IV MAP sensor from a later
Haltech fuel pressure sensors, should you choose or deactivating the fan when the vehicle reaches a pump off when the ECU no longer detects an RPM
model engine, a HT-186511 MAP sensor adapter
to install one. specified speed (vehicle speed sensor is required). signal.
harness can be used to suit (sold separately).

Red/Orange cable Red/Yellow cable

High side drive (+12V) High side drive (+12V)

Early style 3-pin Pressure

sensor connector

+ +
Gen III style MAP sensor
- -
Fuel Pump
CB A

Thermofan
HT-186510 - Oil pressure sensor
adapter harness Chassis Ground Chassis Ground

MAP sensor connector

Coolant Temp, Intake Air Temp Auxiliary High Current Output (25A)
(Label: Coolant Temp / Air Temp) (Label: AX25+) Red/Blue cable
This harness is equipped with connectors This harness also provides a spare high current High side drive (+12V)
compatible with the 2-pin GM LS intake air and output that can supply +12V, rated at 25A.
coolant temperature sensors, as shown below.
This is the Red/Blue 12AWG cable branching out of
the main harness junction near where the grommet
is.
Gen IV style MAP sensor +
The function of this output can be assigned in -
the software to control multiple items such as
transbrake or nitrous solenoids, a second stage fuel Transbrake
pump or thermofan, or simply as a switched +12V Solenoid
supply to provide power to an auxiliary device.
Chassis Ground

Example use of the Auxiliary High Current

HT-186511 - MAP sensor adapter harness Output (25A)

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HARNESS CONNECTIONS Throttle Breakout Connector Wideband Lambda Sensor
(Label: Throt) (Label: WBO2)
Use this connector to plug into a Nexus Rebel
This harness is equipped with a connector that
LS throttle adapter for either electronic or cable
plugs directly into a Bosch LSU 4.9 wideband
Accelerator Pedal Position throttle applications (see diagram below).
lambda sensor (HT-010718).
(Label: APP) A list of available sub-harnesses can be found on
Using a wideband lambda sensor allows the ECU to
Use this connector to connect to a Rebel LS page 3.
leverage functions such as closed-loop fuel control,
accelerator pedal adapter harness if your where the ECU actively targets the desired fuel
application requires Drive-By-Wire (DBW) or mixtures for any RPM and engine load combination.
Electronic Throttle Control. A list of available With a wideband lambda sensor, the ECU can also
adapter harnesses is provided on page 3. implement engine protection strategies when it
HT-010718 - Bosch LSU 4.9 wideband
The adapter harness also includes a wire designed detects that the fuel mixtures are running too lean.
DBW lambda sensor
for connection to a brake pedal switch or brake
light signal, as part of the DBW control strategy. adapter harness
Knock Sensor Inputs
This brake input signal is expected to read +12V (Label: Knock Odd, Knock Even)
whenever the brake pedal is engaged. in the valley of the engine, a Gen III knock sensor
The Rebel LS terminated harness uses Gen IV style adapter harness can be used.
Throttle knock sensor connectors, which plug into each
Brake switch signal Utilizing knock sensors allows the Nexus Rebel LS
connector Cable throttle sensor located on opposite sides of the engine.
ECU to be configured to detect knock and implement
adapter harness
If you have the earlier style knock sensors located knock control strategies.
APP DBW pedal
connector adapter IAC
harness
TPS Haltech CAN connection
(Label: CAN)
This harness is equipped with a DTM-4 connector,
designed for connecting Haltech CAN devices (e.g.,
Display dash, Keypad, PDM).
1 2 3 4 5 6 If you are using multiple Haltech CAN devices, a
Haltech CAN Hub should be used to expand the
12 11 10 9 8 7 number of available ports. iC-7 Dash

Main harness side view

G F E CAN Hub
THROTTLE BREAKOUT CONNECTOR PINOUT
A B C D
PIN FUNCTION COLOR
WB1 / WB2
1 IAC 3 Brown/Green
Main harness side view
2 IAC 4 Brown/Pink
3 IAC 1 Brown/Black
APP PLUG PINOUT
4 IAC 2 Brown/Red
PIN FUNCTION COLOR
5 Sensor Ground Black/White
A Sensor Ground Black/White
6 +5V Orange
B APP 1 White/Brown
7 Throttle TPS 1 White/Orange
C +5V Orange 8 Throttle TPS 2 White/Black
D Sensor Ground Black/White 9 Brake L.Green/Brown
E APP 2 White/Red 10 Unused Unused
Keypad
F +5V Orange 11 Unused Unused
G Brake L.Green/Brown 12 Unused Unused

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CABIN AND TRANSMISSION

Spare In-Cabin Inputs and Outputs

(Label: Inputs / Outputs)
This harness offers in-cabin breakout connectors
populated with spare inputs and outputs available WARRANTY CERTIFICATE
on the Nexus Rebel LS ECU. These spare inputs
and outputs can be wired to additional sensors,
switches, or used to control relays, solenoids, or At Haltech we make every effort to design and Installation of Haltech Products
manufacture fault-free products that perform up to No responsibility whatsoever is accepted by Haltech for
warning lights.
or above the market expectations. All our products the fitment of Haltech Products. The onus is clearly on
J H G F are covered by a Limited 12 Month Warranty. the installer to ensure that both their knowledge and the
parts selected are correct for that particular application.
A B C D E Haltech Limited Warranty Any damage to parts or consequential damage or costs
Unless specified otherwise, Haltech warrants its products resulting from the incorrect installation of Haltech prod-
H G F E Main harness side view
to be free from defects in material or workmanship for a ucts are totally the responsibility of the installer.
period of 12 months from the date of purchase. Always disconnect the battery when doing electrical
A B C D If the Haltech product is found to be defective as men- work on your vehicle. Avoid sparks, open flames or use
tioned above, it will be replaced or repaired if returned of electrical devices near flammable substances. Do not
Main harness side view SPARE IN-CABIN INPUTS PINOUT prepaid along with proof of purchase. Proof of purchase run the engine with a battery charger connected as this
PIN FUNCTION COLOR in the form of a copy of the original purchase invoice, could damage the ECU and other electrical equipment.
receipt or bill of sale which indicates that the product is Do not overcharge the battery or reverse the polarity of
SPARE IN-CABIN OUTPUTS PINOUT A Switched +12V Pink/Brown
within the warranty period, must be presented to obtain the battery or any charging unit. Disconnect the Haltech
PIN FUNCTION COLOR B Sensor Ground Black/White warranty service. ECU from the electrical system whenever doing any
A Switched +12V Pink/Brown C +5V Orange Replacement or repair of a defective product shall con- welding on the vehicle by unplugging the wiring harness
stitute the sole liability of Haltech. To the extent permitted connector from the ECU.
B DPO 1 Violet/Black D AVI 1 White
by law, the foregoing is exclusive and in lieu of all other After completing the ECU installation, make sure there is
C DPO 2 Violet/Brown E SPI 1 Gray/Brown warranties or representations, either expressed or im- no wiring left un-insulated. Uninsulated wiring can cause
D DPO 3 Violet/Red plied, including any implied warranty of merchantability sparks, short circuits and in some cases fire. Before at-
F AVI 2 White/Yellow
or fitness. In no event shall Haltech, be liable for special tempting to run the engine ensure there are no leaks in
E DPO 4 Violet/Orange G SPI 2 Gray/Red or consequential damages. the fuel system.
F DPO 5 Violet/Yellow H SPI 3 Gray/Orange All fuel system components and wiring should be mount-
Product Returns
G DPO 6 Violet/Green J SPI 4 Gray/Yellow ed away from heat sources, shielded if necessary and
Please include a copy of the original purchase invoice, well ventilated. Always ensure that you follow work-
H Switched +12V Pink/Brown K Unused Unused receipt or bill of sale along with the unused, undamaged shop safety procedures. If you’re working underneath a
product and its original packaging. Any product returned jacked-up car, always use safety stands!
with missing accessory items or packaging will incur ex-
tra charges to return the item to a re-saleable condition. _____________________________________________
All product returns must be sent via a freight method
Transmission Breakout Connector with adequate tracking, insurance and proof of delivery Haltech Off-Road Usage Policy
TRANSMISSION BREAKOUT CONNECTOR services. Haltech will not be held responsible for product In many states it is unlawful to tamper with your vehicle’s
(Label: Transmission)
PIN FUNCTION COLOR returns lost during transit. emissions equipment. Haltech products are designed
A breakout connector for a transmission sub- and sold for sanctioned off-road/competition non-emis-
1 Transmission Supply Pink/Red Returns of Products Supplied in Sealed
harness can be utilized for added functionality. The sions controlled vehicles only and may never be used on
list of available sub-harnesses can be found on 2 Power Ground Black Packaging a public road or highway.
page 3. 3 CAN H White The sale of any sensor or accessory supplied in sealed Using Haltech products for street/road use on public
packaging is strictly non-refundable if the sealed pack- roads or highways is prohibited by law unless a specif-
4 CAN L Blue aging has been opened or tampered with. This will be ic regulatory exemption exists (more information can be
5 Transmission / VSS Gray/L.Green clearly noted on the product packaging. If you do not ac- found on the SEMA Action Network website www.sema-
4 3 2 1 cept these terms please return the sensor in its original san.com/emissions for state by state details in the USA).
6 Transmission Gray / Pink
5 6 7 8 unopened packaging within 30 days for a full refund. It is the responsibility of the installer and/or user of this
7 +5V Orange A sensor or accessory product may be returned after 30 product to ensure compliance with all applicable local
8 Sensor Ground Black/White days of purchase (with its sealed packaging intact) for and federal laws and regulations. Please check with your
Main harness side view credit only (no refunds given) and will be subject to a 10% local vehicle authority before purchasing, using or install-
restocking fee. ing any Haltech product.

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12/23

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