Biostar B450GT User manual

FCC Informaon and Copyright
This equipment has been tested and found to comply with the limits of a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protecon
against harmful interference in a residenal installaon. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instrucons,
may cause harmful interference to radio communicaons. There is no guarantee that interference
will not occur in a parcular installaon.
The vendor makes no representaons or warranes with respect to the contents here and
specially disclaims any implied warranes of merchantability or tness for any purpose. Further
the vendor reserves the right to revise this publicaon and to make changes to the contents here
without obligaon to nofy any party beforehand.
Duplicaon of this publicaon, in part or in whole, is not allowed without rst obtaining the
vendor’s approval in wring.
The content of this user’s manual is subject to be changed without noce and we will not be
responsible for any mistakes found in this user’s manual. All the brand and product names are
trademarks of their respecve companies.
Dichiarazione di conformità sinteca
Ai sensi dell’art. 2 comma 3 del D.M. 275 del
30/10/2002
Si dichiara che questo prodoo è conforme
alle normave vigen e soddisfa i requisi
essenziali richies dalle direve
2004/108/CE, 2006/95/CE e 1999/05/CE
quando ad esso applicabili
Short Declaraon of conformity
We declare this product is complying with the
laws in force and meeng all the essenal
requirements as specied by the direcves
2004/108/CE, 2006/95/CE and 1999/05/CE
whenever these laws may be applied

2 | Table Of Contents
Table Of Contents
FCC Informaon and Copyright ������������������������������������������������������������������������������� 1
Chapter 1: Introducon������������������������������������������������������������������������������������������� 3
1.1 Before You Start.................................................................................................................. 3
1.2 Package Checklist................................................................................................................ 3
1.3 Specicaons...................................................................................................................... 4
1.4 Rear Panel Connectors........................................................................................................ 5
1.5 Motherboard Layout .......................................................................................................... 6
Chapter 2: Hardware installaon����������������������������������������������������������������������������� 7
2.1 Install Central Processing Unit (CPU) .................................................................................. 7
2.2 Install a Heatsink................................................................................................................. 8
2.3 Connect Cooling Fans ....................................................................................................... 10
2.4 Install System Memory ..................................................................................................... 11
2.5 Expansion Slots ................................................................................................................. 12
2.6 Jumper & Switch Seng................................................................................................... 13
2.7 Headers & Connectors...................................................................................................... 14
2.8 LEDs .................................................................................................................................. 18
Chapter 3: UEFI BIOS & Soware��������������������������������������������������������������������������� 19
3.1 UEFI BIOS Setup................................................................................................................ 19
3.2 BIOS Update...................................................................................................................... 19
3.3 Soware............................................................................................................................ 23
Chapter 4: Useful help������������������������������������������������������������������������������������������� 33
4.1 Driver Installaon ............................................................................................................. 33
4.2 AMI BIOS Beep Code......................................................................................................... 34
4.3 AMI BIOS post code .......................................................................................................... 34
4.4 Troubleshoong................................................................................................................ 36
4.5 RAID Funcons.................................................................................................................. 37
APPENDIX I: Specicaons in Other Languages ����������������������������������������������������� 39
Arabic...................................................................................................................................... 39
German................................................................................................................................... 40
Russian.................................................................................................................................... 41
Spanish ................................................................................................................................... 42
Thai ......................................................................................................................................... 43
Japan....................................................................................................................................... 44

Chapter 1: Introducon | 3
B450GT
Chapter 1: Introducon
1�1 Before You Start
Thank you for choosing our product. Before you start installing the motherboard, please make
sure you follow the instrucons below:
• Prepare a dry and stable working environment with sucient lighng.
• Always disconnect the computer from power outlet before operaon.
• Before you take the motherboard out from an-stac bag, ground yourself properly
by touching any safely grounded appliance, or use grounded wrist strap to remove the
stac charge.
• Avoid touching the components on motherboard or the rear side of the board unless
necessary. Hold the board on the edge, do not try to bend or ex the board.
• Do not leave any unfastened small parts inside the case aer installaon. Loose parts
will cause short circuits which may damage the equipment.
• Keep the computer from dangerous area, such as heat source, humid air and water.
• The operang temperatures of the computer should be 0 to 45 degrees Celsius.
• To avoid injury, be careful of:
Sharp pins on headers and connectors
Rough edges and sharp corners on the chassis
Damage to wires that could cause a short circuit
1.2 Package Checklist
• Serial ATA Cable x4
• Rear I/O Panel for ATX Case x1
• Quick Installaon Guide x1
• Fully Setup Driver DVD x1
Note
» Thepackagecontentsmaybedierentduetothesalesregionormodelsinwhichitwassold.For
moreinformaonaboutthestandardpackageinyourregion,pleasecontactyourdealerorsales
representave.

4 | Chapter 1: Introducon
1�3 Specifications
Specicaons
CPU Support
Socket AM4 supports Ryzen™ 2000 and 3000 series processors. AMD® Ryzen™ APU (Raven Ridge,
Picasso)/ Ryzen™ CPU (Summit Ridge, Pinnacle Ridge, Masse)
* Please refer to www.biostar.com.tw for CPU support list.
Chipset AMD® B450
Memory
Supports Dual Channel DDR4 1866/2133/2400/2667/2933/3200(OC)
4 x DDR4 DIMM Memory Slot, Max. Supports up to 128 GB Memory
Each DIMM supports non-ECC 8/ 16/ 32 GB DDR4 module
* DDR4 - 2667 only for Ryzen CPU.
* Please refer to www.biostar.com.tw for Memory support list.
Storage
4x SATA III Connector (6Gb/s) : Supports AHCI & RAID 0, 1, 10
1x M.2 (M Key) Socket (M2_PCIE):
Supports M.2 Type 2242/ 2260/ 2280 SSD module
Supports PCI-E 3.0 x4 (32Gb/s) - NVMe/ AHCI SSD
1x M.2 (M Key) Socket (M2_SATA):
Supports M.2 Type 2242/ 2260/ 2280 SSD module
Supports SATA III (6Gb/s) SSD
* M.2 Socket (M2_PCIE) : The bandwidth is depended on CPU, Ryzen is 32Gb/s ; APU is 16Gb/s.
* When M2_SATA slot is occupied, the SATA3 connector will be disabled.
LAN Realtek RTL8111H
10/ 100/ 1000 Mb/s auto negoaon, Half / Full duplex capability
Audio Codec ALC887
7.1 Channels, High Denion Audio, Hi-Fi (Front)
USB 6x USB 3.2 (Gen1) port (4 on rear I/Os and 2 via internal headers)
6x USB 2.0 port (2 on rear I/Os and 4 via internal headers)
Expansion Slots
1x PCIe 2.0 x1 Slot
1x PCIe 2.0 x16 Slot (x4)
1x PCIe 3.0 x16 Slot (When using APU, the bandwidth is x8 lanes)
Rear I/Os
1x PS/2 Keyboard/ Mouse
1x DVI-D Port
1x VGA Port
1x HDMI Port
1x LAN port
4x USB 3.2 (Gen1) Port
2x USB 2.0 Port
3x Audio Jack
Internal I/Os
4x SATA III (6.0Gb/s) Connector
2x USB 2.0 Header (each header supports 2 USB 2.0 ports)
1x USB 3.2 (Gen1) Header (each header supports 2 USB 3.2 (Gen1) ports)
1x 8-Pin Power Connector
1x 24-Pin Power Connector
1x CPU Fan Connector
1x CPU water cooling connector (CPU_OPT)
2x System Fan Connector
1x Front Panel Header
1x Front Audio Header
1x Clear CMOS Header
1x S/PDIF out Connector
1x Serial Port Header
2x LED Header (5V)
1x LED Header (12V)
Form Factor uATX Form Factor, 244 mm x 244 mm
OS Support
Windows 7(64it)/ 10(64bit)
Windows 7(64bit) for Summit Ridge/ Pinnacle Ridge only
Biostar reserves the right to add or remove support for any OS with or without noce.

Chapter 1: Introducon | 5
B450GT
1.4 Rear Panel Connectors
Note
»DVI-D/VGA/HDMIoutputrequireanAMDfamilyprocessorwithintedratedgraphics.
»SincetheaudiochipsupportsHighDenionAudioSpecicaon,thefunconofeachaudiojack
canbedenedbysoware.Theinput/outputfunconofeachaudiojacklistedaboverepresents
thedefaultseng.However,whenconnecngexternalmicrophonetotheaudioport,pleaseuse
theLineIn(Blue)andMicIn(Pink)audiojack.
»Maximumresoluon
DVI-D:1920x1200@60Hz
VGA:1920x1200@60Hz
HDMI:4096x2160@30Hz,compliantwithHDMI1.4
»TheAthlon200GECPUwillnotsupportVGAPortsignals.
»WhenusingthefrontHDaudiojackandplugintheheadset,therearsoundwillbeautomacally
Disabled.

6 | Chapter 1: Introducon
1.5 Motherboard Layout
Note
» representsthe1stpin.

Chapter 2: Hardware installaon | 7
B450GT
Chapter 2: Hardware installaon
2.1 Install Central Processing Unit (CPU)
Step 1: Locate the CPU socket on the motherboard
Step 2: Pull the socket locking out from the socket and then raise the lever up to a 90-degree
angel.
Step 3: Look for the white triangle on socket, and the gold triangle on CPU should point
towards this white triangle. The CPU will t only in the correct orientaon.

8 | Chapter 2: Hardware installaon
Step 4: Hold the CPU down rmly, and then close the lever to locked the posion
Note
» PleaseturnothePowerSupplybeforeremovetheCPUsocket.
2.2 Install a Heatsink
<TypeA>
Step 1: Place the heatsink and fan assembly onto the retenon frame. Match the heatsink clip
with the socket mounng-lug. Hook the spring clip to the mounng-lug.
Step 2: On the other side, push the retenon clip straight down to lock into the plasc lug on
the retenon frame, and then press down the locker unl it stops.

Chapter 2: Hardware installaon | 9
B450GT
<TypeB>
Step 1: Remove the heatsink and fan assembly bracket on the motherboard and keep the
cooler backplane under the motherboard.
Step 2: Place the heatsink and fan assembly on top of the installed CPU and make sure that the
fan cable is closest to the CPU fan connector. Please refer diagram to the following screw into
the screw hole in the order shown.
Note
»DonotforgettoconnecttheCPUfanconnector.
»Forproperinstallaon,pleasekindlyrefertotheinstallaonmanualofyourCPUheatsink.

10 | Chapter 2: Hardware installaon
2.3 Connect Cooling Fans
These fan headers support cooling-fans built in the computer. The fan cable and connector
may be dierent according to the fan manufacturer.
CPU_FAN1: CPU Fan Header
Pin Assignment
1 Ground
2+12V
3 Sense
4 Speed Control Signal
CPU_OPT: CPU Fan Header
PWM Mode DC Mode
Pin Assignment Pin Assignment
1 Ground 1 Ground
2+12V 2Voltage Control
3 Sense 3 Sense
4 Speed Control Signal 4 NC
SYS_FAN1/ SYS_FAN2: System Fan Header
PWM Mode DC Mode
Pin Assignment Pin Assignment
1 Ground 1 Ground
2+12V 2Voltage Control
3 Sense 3 Sense
4 Speed Control Signal 4 NC
Note
» CPU_FAN1,CPU_OPT,SYS_FAN1/2support4-pinand3-pinheadconnectors.Whenconnecng
withwiresontoconnectors,pleasenotethattheredwireistheposiveandshouldbeconnectedto
pin#2,andtheblackwireisGroundandshouldbeconnectedtopin#1(GND).
»CPUFanHeader(CPU_OPT):SupportwatercoolingfanandCPUfan.

Chapter 2: Hardware installaon | 11
B450GT
2.4 Install System Memory
DDR4 Modules
Step 1: Unlock a DIMM slot by pressing the retaining clips outward. Align a DIMM on the slot
such that the notch on the DIMM matches the break on the slot.
Step 2: Insert the DIMM vercally and rmly into the slot unl the retaining clips snap back in
place and the DIMM is properly seated.
Note
» IftheDIMMdoesnotgoinsmoothly,donotforceit.Pullitallthewayoutandtryagain.
Memory Capacity
DIMM Socket Locaon DDR4 Module Total Memory Size
DIMMA1 8GB/16GB/32GB
Max is 128GB.
DIMMA2 8GB/16GB/32GB
DIMMB1 8GB/16GB/32GB
DIMMB2 8GB/16GB/32GB

12 | Chapter 2: Hardware installaon
Dual Channel Memory Installaon
Please refer to the following requirements to acvate Dual Channel funcon:
Install memory module of the same density in pairs, shown in the table.
Dual Channel Status DIMMA1 DIMMA2 DIMMB1 DIMMB2
Enabled O XOX
Enabled XOXO
Enabled O O O O
(O means memory installed, X means memory not installed.)
Note
» Wheninstallingmorethanonememorymodule,werecommendtousethesamebrandand
capacitymemoryonthismotherboard.
2.5 Expansion Slots
PEX16_1: PCI-Express Gen3 x16 Slot (x16 lanes)
(When using APU, the bandwidth is x8 lanes)
• PCI-Express 3.0 compliant.
• Theorecal maximum bandwidth using two slots simultaneously is 16GB/s for each slot,
a total of 32GB/s.
PEX16_SB_1: PCI-Express Gen2 x16 Slot (x4 lanes)
• PCI-Express 2.0 compliant.
• Theorecal maximum bandwidth using two slots simultaneously is 2GB/s for each slot, a
total of 4GB/s.
PEX1_1: PCI-Express Gen2 x1 Slot
• PCI-Express 2.0 compliant.
• Data transfer bandwidth up to 500MB/s per direcon; 1GB/s in total.
M2_PCIE/ M2_SATA: M.2 (M Key) Slot
• The M.2 slot supports M.2 Type 2242/2260/2280 SSD module. When installing M.2 SSD
module, please place the screw and hex pillar to correct posion.
• M2_PCIE (The bandwidth is depended on CPU, Ryzen is 32Gb/s ; APU is 16Gb/s):
Supports M.2 PCI Express module up to Gen3 x4 (32Gb/s) - NVMe/ AHCI SSD.
• M2_SATA: Supports M.2 SATA III (6Gb/s) module.
Note
»WhenM2_SATAslotisoccupied,theSATA3connectorwillbedisabled.

Chapter 2: Hardware installaon | 13
B450GT
Install an Expansion Card
You can install your expansion card by following steps:
• Read the related expansion card’s instrucon document before install the expansion
card into the computer.
• Remove your computer’s chassis cover, screws and slot bracket from the computer.
• Place a card in the expansion slot and press down on the card unl it is completely
seated in the slot.
• Secure the card’s metal bracket to the chassis back panel with a screw. (This step is only
for installing a VGA card.).
• Replace your computer’s chassis cover.
• Power on the computer, if necessary, change BIOS sengs for the expansion card.
• Install related driver for the expansion card.
Note
»PleasebenotethatyouwillneedtouseM2typescrewdriverifyouwanttoinstalloruninstallthe
screw.Itisrecommendednottouseascrewdriverthatdoesnotmeetthespecicaons,otherwise
thescrewmaybedamaged.
2.6 Jumper & Switch Setting
The illustraon shows how to set up jumpers. When the jumper cap is placed on pins, the
jumper is “close”, if not, that means the jumper is “open”.
Pin opened Pin closed Pin 1-2 closed
JCMOS1: Clear CMOS Jumper
The jumper allows users to restore the BIOS safe seng and the CMOS data. Please carefully
follow the procedures to avoid damaging the motherboard.
Pin 1-2 Open:
Normal Operaon (default).
Pin 1-2 Short: Clear CMOS data.

14 | Chapter 2: Hardware installaon
Clear CMOS Procedures:
1. Remove AC power line.
2. Set the jumper to “Pin 1-2 short”, you can use a metal object like a screwdriver to touch
the two pins.
3. Wait for ve seconds.
4. Aer clearing the CMOS values, be sure the jumper is “Pin 1-2 open”.
5. Power on the AC.
6. Load Opmal Defaults and save sengs in CMOS.
2.7 Headers & Connectors
ATXPWR1: ATX Power Source Connector
For beer compability, we recommend to use a standard ATX 24-pin power supply for this
connector. Make sure to nd the correct orientaon before plugging the connector.
Pin Assignment Pin Assignment
13 +3.3V 1+3.3V
14 -12V 2+3.3V
15 Ground 3 Ground
16 PS_ON 4+5V
17 Ground 5 Ground
18 Ground 6 +5V
19 Ground 7 Ground
20 NC 8PW_OK
21 +5V 9Standby Voltage+5V
22 +5V 10 +12V
23 +5V 11 +12V
24 Ground 12 +3.3V
ATXPWR2: ATX Power Source Connector
The connector provides +12V to the CPU power circuit. If the CPU power plug is 4-pin, please
plug it into Pin 1-2-5-6 of ATXPWR2.
Pin Assignment
1+12V
2+12V
3+12V
4+12V
5 Ground
6 Ground
7 Ground
8 Ground
Note
» Beforeyoupoweronthesystem,pleasemakesurethatbothATXPWR1andATXPWR2connectors
havebeenplugged-in.
» Insucientpowersuppliedtothesystemmayresultininstabilityortheperipheralsnotfunconing
properly.UseofaPSUwithahigherpoweroutputisrecommendedwhenconguringasystemwith
morepower-consumingdevices.

Chapter 2: Hardware installaon | 15
B450GT
PANEL1: Front Panel Header
This 16-pin header includes Power-on, Reset, HDD LED, Power LED, and speaker connecon.
Pin Assignment Funcon Pin Assignment Funcon
1+5V
Speaker
Connector
9N/A N/A
2N/A 10 N/A
3N/A 11 N/A N/A
4 Speaker 12 Power LED (+) Power
LED
5 HDD LED (+) Hard drive
LED
13 Power LED (+)
6HDD LED (-) 14 Power LED (-)
7 Ground Reset
buon
15 Power buon Power-on
buon
8 Reset control 16 Ground
SATA1 (SATA1_U/ SATA1_L)/ SATA2/ SATA3: Serial ATA 6.0 Gb/s Connectors
These connectors connect to SATA hard disk drives via SATA cables.
Pin Assignment
1 Ground
2TX+
3TX-
4 Ground
5RX-
6RX+
7 Ground
Note
»WhenM2_SATAslotisoccupied,theSATA3connectorwillbedisabled.
JFRONT_USB3_1: Header for USB 3.2 Gen1 (5Gb/s) Ports at Front Panel
This header allows user to add addional USB ports on the PC front panel, and also can be
connected with a wide range of external peripherals.
Pin Assignment Pin Assignment
1VBUS0 11 D2+
2SSRX1- 12 D2-
3SSRX1+ 13 Ground
4 Ground 14 SSTX2+
5SSTX1- 15 SSTX2-
6SSTX1+ 16 Ground
7 Ground 17 SSRX2+
8D1- 18 SSRX2-
9 D1+ 19 VBUS1
10 ID 20 Key

16 | Chapter 2: Hardware installaon
F_USB1/ F_USB2: Header for USB 2.0 Ports at Front Panel
This header allows user to add addional USB ports on the PC front panel, and also can be
connected with a wide range of external peripherals.
Pin Assignment
1+5V (fused)
2+5V (fused)
3USB-
4USB-
5 USB+
6 USB+
7 Ground
8 Ground
9Key
10 NC
JSPDIF_OUT1: Digital Audio-out Connector
The connector is for connecng the S/PDIF output bracket.
Pin Assignment
1 Ground
2SPDIF_OUT
3NA
4+5V
F_AUDIO1: Front Panel Audio Header
This header allows user to connect the chassis-mount front panel audio I/O which supports HD
and AC’97 audio standards.
HD Audio AC’97
Pin Assignment Pin Assignment
1Mic Le in 1 Mic In
2 Ground 2 Ground
3 Mic Right in 3 Mic Power
4 GPIO 4 Audio Power
5 Right line in 5 RT Line Out
6 Jack Sense 6 RT Line Out
7 Front Sense 7 Reserved
8Key 8Key
9Le line in 9 LFT Line Out
10 Jack Sense 10 LFT Line Out
Note
» Itisrecommendedthatyouconnectahigh-denionfrontpanelaudiomoduletothisconnectorto
availofthemotherboard’shighdenionaudiocapability.
» Pleasetrytodisablethe“FrontPanelJackDetecon”ifyouwanttouseanAC’97frontaudiooutput
cable.ThefunconcanbefoundviaO.S.AudioUlity.

Chapter 2: Hardware installaon | 17
B450GT
J_COM1: Serial Port Connector
The motherboard has a serial port header for connecng RS-232 Port.
Pin Assignment
1 Carrier detect
2 Received data
3Transmied data
4 Data terminal ready
5 Signal ground
6 Data set ready
7 Request to send
8 Clear to send
9 Ring indicator
10 Key
12V_LED: RGB LED Device (5050 SMD) Header
This header providers 12V power and RGB control pins for RGB LED Device (5050 SMD).
Pin Cable Color Assignment
112V (Black) VCC12
2 G (Green) LED_GREEN
3 R (Red) LED_RED
4 B (Blue) LED_BLUE
5V_LED1/ 5V_LED2: Addressable RGB LED Device (WS2818B) Header
This header providers 5V power and Data control pins for ARGB LED Device (WS2818B).
Pin Assignment
1VCC5
2Data
3N/A
4GND
Note
» EnsureproperpinconnecngtoyourLEDdevice,wrongconneconmaydamageyourLEDdeviceor
motherboard.
»The12V_LEDconnectorsupportsto5050RGBLEDstripswiththemaximumpowerrangof3A
(12V).
»The5V_LEDconnectorsupportsupto300LEDsWS2818BindividuallyAddressableRGBLEDstrips
withthemaximumpowerrangof3A(5V).
»PleaseusetheVividLEDDJsowaretocontroltheLEDs.Fordetailedsowaresenginformaon,
refertochapter3.3.

18 | Chapter 2: Hardware installaon
2.8 LEDs
LEDs
Below LEDs are controlled by RACING GT EVO program. Please refer to Chapter 3.3 for more
detail soware seng.
ARGB/ RGB LED Header (5V/ 12V)

Chapter 3: UEFI BIOS & Soware | 19
B450GT
Chapter 3: UEFI BIOS & Soware
3.1 UEFI BIOS Setup
• The BIOS Setup program can be used to view and change the BIOS sengs for the
computer. The BIOS Setup program is accessed by pressing the <DEL> key aer the
Power-On Self-Test (POST) memory test begins and before the operang system boot
begins.
• For further informaon of seng up the UEFI BIOS, please refer to the UEFI BIOS Manual
on our website.
3.2 BIOS Update
The BIOS can be updated using either of the following ulies:
• BIOSTAR BIO-Flasher: Using this ulity, the BIOS can be updated from a le on a hard
disk, a USB drive (a ash drive or a USB hard drive), or a CD-ROM.
• BIOSTAR BIOS Update Ulity: It enables automated updang while in the Windows
environment. Using this ulity, the BIOS can be updated from a le on a hard disk, a USB
drive (a ash drive or a USB hard drive), or a CD-ROM, or from the le locaon on the
Web.
BIOSTAR BIO-Flasher
Note
» ThisulityonlyallowsstoragedevicewithFAT32/16formatandsingleparon.
» ShungdownorresengthesystemwhileupdangtheBIOSwillleadtosystembootfailure.
Updang BIOS with BIOSTAR BIO-Flasher
1. Go to the website to download the latest BIOS le for the motherboard.
2. Then, copy and save the BIOS le into a USB ash (pen) drive.(Only supported FAT/FAT32
format)
3. Insert the USB pen drive that contains the BIOS le to the USB port.
4. Power on or reset the computer and then press <F12> during the POST process.
5. Aer entering the POST screen, the BIO-FLASHER
ulity pops out. Choose <fs0> to search for the BIOS
le.

20 | Chapter 3: UEFI BIOS & Soware
6. Select the proper BIOS le, and a message asking
if you are sure to ash the BIOS le. Click “Yes” to
start updang BIOS.
7. A dialog pops out aer BIOS ash is completed,
asking you to restart the system. Press the <Y> key
to restart system.
8. While the system boots up and the full screen logo shows up, press <DEL> key to enter BIOS
setup.
Aer entering the BIOS setup, please go to the <Save & Exit>, using the <Restore Defaults>
funcon to load Opmized Defaults, and select <Save Changes and Reset> to restart the
computer. Then the BIOS Update is completed.
BIOS Update Ulity (through the Internet)
1. Installing BIOS Update Ulity from the DVD Driver.
2. Please make sure the system is connected to the internet before using this funcon.
3. Launch BIOS Update Ulity and click the
“Online Update” buon on the main screen.
4. An open dialog will show up to request your
agreement to start the BIOS update. Click “Yes”
to start the online update procedure.
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