Sony SU-WL500 Instructions (SU-WL500 Wall-Mount... User manual

C-644-100-12(1)
To Customers and Sony Dealers
Wall-Mount Bracket
Installation Manual
Manuel d’installation
Manual de instalación
GB
FR
ES
SU-WL500
© 2017 Sony Corporation

2 (GB)
Thank you for purchasing this product.
If the safety precautions are not observed or the
product is used incorrectly, it may result in serious
injury or fire.
This manual shows the correct handling of the
product and important precautions necessary to
prevent accidents. Be sure to read this manual
thoroughly and use the product correctly. Keep this
manual available for future reference.
To Sony dealers
Sufficient expertise is required for installing this
product. Be sure to read this manual thoroughly to do
the installation work safely. Sony is not liable for any
damages or injury caused by mishandling or
improper installation. Please give this manual to the
customer after installation.
Products by Sony are designed with safety in mind. If
the products are used incorrectly, however, it may
result in a serious injury through fire, electric shock,
the product toppling over, or the product dropping.
Be sure to observe the precautions for safety to
prevent such accidents.
Specified products
The following products are subject to change
without notice, may be out of stock, or
discontinued.
Some models may not be available in certain
regions.
To Customers
Sufficient expertise is required for installing this
product. Be sure to subcontract the installation to
Sony dealers or licensed contractors and pay
special attention to safety during the installation.
Sony is not liable for any damages or injury
caused by mishandling or improper installation, or
installing any other than the specified product.
Your Statutory Rights (if any) are not affected.
WARNING
On Safety
CAUTION
LCD Color TV
XBR-75X900E
XBR-65X900E
XBR-55X900E
XBR-49X900E
XBR-75X850E
XBR-65X850E
XBR-55X800E
XBR-49X800E
XBR-43X800E
KD-75X9000E
KD-65X9000E
KD-55X9000E
KD-49X9000E
KD-75X8500E
KD-65X8500E
KD-55X8500E
KD-49X8000E
KD-43X8000E

3 (GB)
GB
English
There are 4 types of installation. It may not be possible to install some types of TVs. Check the following and
install your TV in the adequate way.
AC adaptor holder kit SU-AH1 is not be able to installed.
To install the TV to the wall, the SU-WL500 Wall Mount Bracket is necessary. Screws and spacers listed below are
also necessary depending on the way of installation.
For further details/terms & conditions, contact the sales representative for professional use.
*1 You cannot install the TV other than the noted types.
*2 For the TV with , the following are neccesary.
Spacer: a washer with an outside diameter of 18 mm, inside diameter of 10 mm, and thickness of 2 mm
(SONY Part Number 7-688-000-32) × 20
Screw: PSW M6 × 25 mm (SONY Part Number 4-577-326-01) × 4 (1 pk)
*3 Make brightness setting to Standard or Custom 45 and lower.
*4 Make brightness setting of KD-55X8500E to Standard or Custom 30 and lower.
*5 Make brightness setting to Standard or Custom 35 and lower.
A: Landscape, -20° leaning B: Landscape, +60° leaning C: Portrait, no leaning D: Portrait, +20° leaning
TV model Installation type*1 Spacer*2 Wall-Mount Bracket
Model Qty
XBR-75X900E KD-75X9000E A
SU-WL500 1
C
XBR-65X900E
XBR-55X900E
XBR-49X900E
KD-65X9000E
KD-55X9000E
KD-49X9000E
A
C
XBR-75X850E KD-75X8500E A
B*3
XBR-65X850E KD-65X8500E
KD-55X8500E
A
B
C*4
D*4
XBR-55X800E
XBR-49X800E KD-49X8000E
A*5
B*5
C*5
D*5
XBR-43X800E KD-43X8000E
C*5
D*5

4 (GB)
Be sure to read thoroughly the all safety information
described in the instruction manual of SU-WL500.
Do NOT use SU-WL450 for installation in the way
noted in this manual.
Provide adequate clearances
around the TV.
The following illustration shows how much space is
required around the TV.
Be sure to install the TV in the orientation shown in
the following illustration.
Landscape
Portrait
Do not block the ventilation holes of
the TV.
If you block the ventilation holes with tapes or other
objects, heat builds up inside the TV and may cause a
fire.
• When installing in portrait orientation, only the
following input/output jacks are available:
– HDMI IN 1/2/3/4 (Support 4K resolution, HDCP
2.2-compatible)
– DIGITAL AUDIO OUT (OPTICAL)
–AUDIOOUT /(Stereo mini jack)
– USB 1/2, USB 3
–LAN
– HDMI1 AUDIO IN (There may be no jack
depending on the country or region.)
• If you cover the illumination LED and its
surroundings with tapes or other objects, the
status of the TV cannot be recognized and the
remote control may not work.
• When carrying the TV, hold it in landscape
orientation, and take care not to drop it when
installing. Do not apply excessive force to the TV;
otherwise, it may be deformed.
WARNING
If the following precautions are not observed,
serious injury or death through fire, electric
shock, the product toppling over, or the
product dropping can result.
Unit: mm (inches)
300
(11 7/8)
100
(4)
100
(4)
100
(4)
Unit: mm (inches)
300
(11 7/8)
100
(4)
100
(4)
100
(4)
Others

5 (GB)
Follow Step 1 in the SU-WL500 instruction manual to
check the parts.
Follow Step 2 in the SU-WL500 instruction manual to
decide on the installation location. Refer to page 18
of this manual for the TV installation dimension table.
Follow Step 3 in the SU-WL500 instruction manual to
install the Base Bracket.
A: landscape, -20° leaning
Step 1:
Checking the parts
required for the
installation
Step 2:
Deciding on the
installation location
Step 3:
Installing the Base
Bracket on the wall
Step 4:
Preparing for the
installation of the TV
1Remove the stand if it is
installed to the TV.
Lay down the TV and lay a soft cloth under the
TV to protect the TV monitor.
XBR-75X900E/XBR-65X900E/XBR-55X900E/
XBR-49X900E/XBR-75X850E/XBR-65X850E/
XBR-55X800E/KD-75X9000E/KD-65X9000E/
KD-55X9000E/KD-49X9000E/KD-75X8500E/
KD-65X8500E/KD-55X8500E
XBR-49X800E/KD-49X8000E
When using an electric screwdriver, set the torque
setting to approximately 2 N·m {20 kgf·cm}.
Do not lift the Mounting Hook before the screws
(two screws each for left/right) are secured. This
may distort the Mounting Hook or the TV cabinet.

6 (GB)
2Remove the screws from the
rear of the TV.
XBR-75X900E/XBR-65X900E/XBR-55X900E/
XBR-49X900E/XBR-65X850E/KD-75X9000E/
KD-65X9000E/KD-55X9000E/KD-49X9000E/
KD-65X8500E/KD-55X8500E
XBR-75X850E/KD-75X8500E
3Referring to the Screw and Hook
locations diagram/table on
page 20, determine the screw
positions, and secure the
Mounting Hook to the rear of the
TV.
Secure the Mounting Hook to the rear of the
TV temporarily, using the four screws (*1, *2).
Be sure that both screws are securely
tightened with equal torque strength to the
rear of the TV.
*1 Needs 5 spacers (not supplied) and screws
PSW M6 × 25 mm (not supplied):
XBR-75X900E/XBR-75X850E/XBR-65X850E/
KD-75X9000E/KD-75X8500E/KD-65X8500E/
KD-55X8500E
*2 No spacers necessary, but screws of PSW 6 ×
16 mm are necessary (supplied):
XBR-65X900E/XBR-55X900E/XBR-49X900E/
XBR-55X800E/XBR-49X800E/KD-65X9000E/
KD-55X9000E/KD-49X9000E/KD-49X8000E
Mounting Hook
Screw*1, *2
Spacer*1, *2
10 mm (13/32 inch)

7 (GB)
4Adjust the angle of the
Mounting Hook with the
supplied hex key.
Perform following and . Make sure that
screw firmly secures the arm base of the
Mounting Hook (both left and right).
Remove the 2 screws from the arm base
of the Mounting Hook (both left and right)
and determine the screw holes for the angle
(20°) you plan to change to.
Fit screw holes of the upper arm and
lower arm in an adequate angle, put
screws removed in step into the holes,
then secure both arms.
Notes
• Make sure that the adjusted angle of both arms are
the same.
• Make sure that both arms are screwed in securely.
CAUTION
• Be careful not to get your fingers caught while
adjusting the angle.
Hex key
Step 5:
Installing the TV on the
wall
WARNING
Be sure to complete the installation before
connecting the AC power cord to the wall outlet. If
you allow the AC power cord to be pinched under
or between pieces of equipment, this may result
in a short circuit or an electric shock.
Be careful not to stumble over the AC power cord
or the TV, as you may hurt yourself.
1Connect the AC power cord and
the connecting cable(s) supplied
with the TV to the TV.
Connect the AC power cord and the connecting
cable(s) to the connectors on the rear of the TV.
For details on connecting the AC power cord
and the connecting cable(s), refer to the
instruction manual of the TV.
Notes
• You cannot connect the cables to the TV after
installing it on the Base Bracket.
• Subcontract the cable routing in the wall to a
licensed contractor.

8 (GB)
Follow the instructions in the SU-WL500 instruction
manual to confirm.
Follow the instructions in the SU-WL500 instruction
manual to remove.
2Install the TV onto the Base
Bracket.
Referring to the Screw and Hook locations
diagram/table on page 20, determine the
holes of the Base Bracket for latching the
upper hooks of the Mounting Hook.
Hold the TV securely with both hands, and
gently align it on the wall.
WARNING
• Be sure that two or more persons hold the TV when
carrying it.
• When carrying the TV, hold it in landscape
orientation, and take care not to drop it when
installing. Do not apply excessive force to the TV;
otherwise, it may be deformed.
Base Bracket
Mounting Hook
3Firmly secure the TV and the
Base Bracket using the screw
supplied with SU-WL500
(+BVST4 × 12).
Note
When using an electric screwdriver, set the torque
setting to approximately 1.5 N·m {15 kgf·cm}.
Confirming the
completion of the
installation
When removing the TV
Screw
(+BVST4 × 12)
WARNING
Be sure to tighten the securing screw firmly.
If you fail to do so, the TV may fall when it is
pushed upward and cause injury.

9 (GB)
Follow Step 1 in the SU-WL500 instruction manual to
check the parts.
Follow Step 2 in the SU-WL500 instruction manual to
decide on the installation location. Refer to page 18
of this manual for the TV installation dimension table.
Follow Step 3 in the SU-WL500 instruction manual to
install the Base Bracket.
B: landscape, +60° leaning
Step 1:
Checking the parts
required for the
installation
Step 2:
Deciding on the
installation location
Step 3:
Installing the Base
Bracket on the wall or
mounting
Step 4:
Preparing for the
installation of the TV
1Remove the stand if it is
installed to the TV.
Lay down the TV and lay a soft cloth under the
TV to protect the TV monitor.
XBR-75X850E/XBR-65X850E/XBR-55X800E/
KD-75X8500E/KD-65X8500E/KD-55X8500E
XBR-49X800E/KD-49X8000E
When using an electric screwdriver, set the torque
setting to approximately 2 N·m {20 kgf·cm}.
Do not lift the Mounting Hook before the screws
(two screws each for left/right) are secured. This
may distort the Mounting Hook or the TV cabinet.

10 (GB)
2Remove the screws from the
rear of the TV.
XBR-65X850E/KD-65X8500E/KD-55X8500E
XBR-75X850E/KD-75X8500E
3Referring to the Screw and Hook
locations diagram/table on
page 20, determine the screw
positions, and secure the
Mounting Hook to the rear of the
TV.
Secure the Mounting Hook to the rear of the
TV temporarily, using the four screws (*1, *2).
Be sure that both screws are securely
tightened with equal torque strength to the
rear of the TV.
*1 Needs 5 spacers (not supplied) and screws
PSW M6 × 25 mm (not supplied):
XBR-65X850E/KD-65X8500E/KD-55X8500E
*2 No spacers necessary, but screws of PSW 6 ×
16 mm are necessary (supplied):
XBR-75X850E/XBR-55X800E/XBR-49X800E/
KD-75X8500E/KD-49X8000E
Mounting Hook
Screw*1, *2
Spacer*1, *2
10 mm (13/32 inch)

11 (GB)
4Make sure that the screw 
firmly secures the arm base of
the Mounting Hook (both left
and right).
Note
Make sure that the two arms are screwed in securely.
Step 5:
Installing the TV on the
wall
WARNING
Be sure to complete the installation before
connecting the AC power cord to the wall outlet. If
you allow the AC power cord to be pinched under
or between pieces of equipment, this may result
in a short circuit or an electric shock.
Be careful not to stumble over the AC power cord
or the TV, as you may hurt yourself.
1Connect the AC power cord and
the connecting cable(s) supplied
with the TV to the TV.
Connect the AC power cord and the connecting
cable(s) to the connectors on the rear of the TV.
For details on connecting the AC power cord
and the connecting cable(s), refer to the
instruction manual of the TV.
Notes
• You cannot connect the cables to the TV after
installing it on the Base Bracket.
• Subcontract the cable routing in the wall to a
licensed contractor.

12 (GB)
Follow the instructions in the SU-WL500 instruction
manual to confirm.
Follow the instructions in the SU-WL500 instruction
manual to remove.
2Install the TV onto the Base
Bracket.
Referring to the Screw and Hook locations
diagram/table on page 20, determine the
holes of the Base Bracket for latching the
upper hooks of the Mounting Hook.
Hold the TV securely with both hands, and
gently align it on the wall.
WARNING
• Be sure that two or more persons hold the TV when
carrying it.
• When carrying the TV, hold it in landscape
orientation, and take care not to drop it when
installing. Do not apply excessive force to the TV;
otherwise, it may be deformed.
Base Bracket
Mounting Hook
3Firmly secure the TV and the
Base Bracket using the screw
supplied with SU-WL500
(+BVST4 × 12).
Note
When using an electric screwdriver, set the torque
setting to approximately 1.5 N·m {15 kgf·cm}.
Confirming the
completion of the
installation
When removing the TV
Screw
(+BVST4 × 12)
WARNING
Be sure to tighten the securing screw firmly.
If you fail to do so, the TV may fall when it is
pushed upward and cause injury.

13 (GB)
Follow Step 1 in the SU-WL500 instruction manual to
check the parts.
Follow Step 2 in the SU-WL500 instruction manual to
decide on the installation location. Refer to page 19
of this manual for the TV installation dimension table.
Follow Step 3 in the SU-WL500 instruction manual to
install the Base Bracket.
C: portrait, no leaning / D: portrait, +20° leaning
Step 1:
Checking the parts
required for the
installation
Step 2:
Deciding on the
installation location
Step 3:
Installing the Base
Bracket on the wall or
mounting
Step 4:
Preparing for the
installation of the TV
1Remove the stand if it is
installed to the TV.
Lay down the TV and lay a soft cloth under the
TV to protect the TV monitor.
XBR-75X900E/XBR-65X900E/XBR-55X900E/
XBR-49X900E/XBR-65X850E/XBR-55X800E/
KD-75X9000E/KD-65X9000E/KD-55X9000E/
KD-49X9000E/KD-65X8500E/KD-55X8500E
XBR-49X800E/XBR-43X800E/KD-49X8000E/
KD-43X8000E
When using an electric screwdriver, set the torque
setting to approximately 2 N·m {20 kgf·cm}.
Do not lift the Mounting Hook before the screws
(two screws each for left/right) are secured. This
may distort the Mounting Hook or the TV cabinet.

14 (GB)
2Remove the screws from the
rear of the TV.
XBR-75X900E/XBR-65X900E/XBR-55X900E/
XBR-49X900E/XBR-65X850E/KD-75X9000E/
KD-65X9000E/KD-55X9000E/KD-49X9000E/
KD-65X8500E/KD-55X8500E
3Referring to the Screw and Hook
locations diagram/table on
page 20, determine the screw
positions, and secure the
Mounting Hook to the rear of the
TV.
Secure the Mounting Hook to the rear of the
TV temporarily, using the four screws
(+PSW6 × 25).
Be sure that both screws are securely
tightened with equal torque strength to the
rear of the TV.
Screw
(+PSW6 × 25)
(not supplied)
Mounting
Hook
Spacer × 5
(not supplied)
10 mm (13/32 inch)
4Make sure that the screw 
firmly secures the arm base of
the Mounting Hook (both left
and right).
Notes
• When installing in portrait orientation, be sure to
keep the Mounting Hook angle to 0 degrees. Do
not use another angles.
• Make sure that the two arm bases are screwed in
securely.

15 (GB)
Step 5:
Installing the TV on the
wall
WARNING
Be sure to complete the installation before
connecting the AC power cord to the wall outlet. If
you allow the AC power cord to be pinched under
or between pieces of equipment, this may result
in a short circuit or an electric shock.
Be careful not to stumble over the AC power cord
or the TV, as you may hurt yourself.
1Connect the AC power cord and
the connecting cable(s) supplied
with the TV to the TV.
Connect the AC power cord and the connecting
cable(s) to the connectors on the rear of the TV.
For details on connecting the AC power cord
and the connecting cable(s), refer to the
instruction manual of the TV.
Notes
• You cannot connect the cables to the TV after
installing it on the Base Bracket.
• Subcontract the cable routing in the wall to a
licensed contractor.
2Install the TV onto the Base
Bracket.
Referring to the Screw and Hook locations
diagram/table on page 20, determine the
holes of the Base Bracket for latching the
upper hooks of the Mounting Hook.
Hold the TV securely with both hands, and
gently align it on the wall.
WARNING
• Be sure that two or more persons hold the TV when
carrying it.
• When carrying the TV, hold it in landscape
orientation, and take care not to drop it when
installing. Do not apply excessive force to the TV;
otherwise, it may be deformed.
C: Portrait, no leaning
Base Bracket
Mounting Hook

16 (GB)
D: Portrait, +20° leaning
Base Bracket
Mounting Hook
3Firmly secure the TV and the
Base Bracket using the screw
supplied with SU-WL500
(+BVST4 × 12).
C: Portrait, no leaning
Screw
(+BVST4 × 12)

17 (GB)
Follow the instructions in the SU-WL500 instruction
manual to confirm.
Follow the instructions in the SU-WL500 instruction
manual to remove.
D: Portrait, +20° leaning
Note
When using an electric screwdriver, set the torque
setting to approximately 1.5 N·m {15 kgf·cm}.
Confirming the
completion of the
installation
When removing the TV
Screw
(+BVST4 × 12)
WARNING
Be sure to tighten the securing screw firmly.
If you fail to do so, the TV may fall when it is
pushed upward and cause injury.

18 (GB)
The table below shows the dimensions of the TV that is mounted on this product. Refer to this table to decide
on the installation location.
A: Landscape, -20° leaning
B: Landscape, +60° leaning
Unit: mm (inches)
Some models may not be available in certain regions.
Figures in the above table may differ slightly depending on the installation.
WARNING
The wall that the TV will be installed on should be capable of supporting a weight of at least four times that of
the TV.
Refer to your TV’s instructions for its weight.
TV installation dimensions table
Model Name
Display dimensions
Length for each mounting angle
Angle (20º) Angle (60º)
XBR-75X900E
KD-75X9000E
1,674
(66)
959
(37 7/8)
98
(3 7/8)
549
(21 5/8)
410
(16 1/4)
901
(35 1/2) ————
XBR-65X900E
KD-65X9000E
1,447
(57)
830
(32 3/4)
103
(4 1/8)
494
(19 1/2)
369
(14 5/8)
780
(30 3/4) ————
XBR-55X900E
KD-55X9000E
1,228
(48 3/8)
707
(27 7/8)
161
(6 3/8)
494
(19 1/2)
327
(12 7/8)
664
(26 1/4) ————
XBR-49X900E
KD-49X9000E
1,093
(43 1/8)
631
(24 7/8)
213
(8 1/2)
511
(20 1/8)
297
(11 3/4)
592
(23 3/8) ————
XBR-75X850E
KD-75X8500E
1,677
(66 1/8)
968
(38 1/8)
11
(7/16)
469
(18 1/2)
424
(16 3/4)
910
(35 7/8)
547
(21 5/8)
840
(33 1/8)
527
(20 3/4)
109
(4 3/8)
XBR-65X850E
KD-65X8500E
1,454
(57 1/4)
840
(33 1/8)
121
(4 7/8)
518
(20 1/2)
353
(14)
790
(31 1/8)
411
(16 1/4)
729
(28 3/4)
456
(18)
110
(4 3/8)
KD-55X8500E 1,232
(48 5/8)
717
(28 1/4)
187
(7 3/8)
527
(20 3/4)
322
(12 3/4)
674
(26 5/8)
507
(20)
623
(24 5/8)
403
(15 7/8)
123
(4 7/8)
XBR-55X800E 1,232
(48 5/8)
716
(28 1/4)
147
(5 7/8)
488
(19 1/4)
330
(13)
675
(26 5/8)
467
(18 1/2)
623
(24 5/8)
406
(16)
117
(4 5/8)
XBR-49X800E
KD-49X8000E
1,096
(43 1/4)
640
(25 1/4)
151
(6)
456
(18)
315
(12 1/2)
603
(23 3/4)
434
(17 1/8)
557
(22)
369
(14 5/8)
117
(4 5/8)
Screen center point

19 (GB)
C: Portrait, no leaning
D: Portrait, +20° leaning
Unit: mm (inches)
Some models may not be available in certain regions.
Figures in the above table may differ slightly depending on the installation.
WARNING
The wall that the TV will be installed on should be capable of supporting a weight of at least four times that of
the TV.
Refer to your TV’s instructions for its weight.
Model Name
Display dimensions Screen center dimensions
Length for each mounting angle
Angle (0º) Angle (20º)

XBR-75X900E
KD-75X9000E
959
(37 7/8)
1,674
(66)
171
(6 3/4)
130
(5 1/8)
354
(14)
1,008
(39 3/4)
136
(5 3/8) ——
XBR-65X900E
KD-65X9000E
830
(32 3/4)
1,447
(57)
121
(4 7/8)
69
(2 3/4)
351
(13 7/8)
845
(33 3/8)
130
(5 1/8) ——
XBR-55X900E
KD-55X9000E
707
(27 7/8)
1,228
(48 3/8)
121
(4 7/8)
7
(9/32)
351
(13 7/8)
735
(29)
130
(5 1/8) ——
XBR-49X900E
KD-49X9000E
631
(24 7/8)
1,093
(43 1/8)
271
(10 3/4)
102
(4 1/8)
218
(8 5/8)
818
(32 1/4)
132
(5 1/4) ——
XBR-65X850E
KD-65X8500E
840
(33 1/8)
1,454
(57 1/4)
121
(4 7/8)
145
(5 3/4)
281
(11 1/8)
848
(33 1/2)
110
(4 3/8)
518
(20 1/2)
1,369
(54)
KD-55X8500E 717
(28 1/4)
1,232
(48 5/8)
171
(6 3/4)
30
(1 3/16)
336
(13 1/4)
787
(31)
123
(4 7/8)
451
(17 7/8)
1,162
(45 3/4)
XBR-55X800E 716
(28 1/4)
1,232
(48 5/8)
221
(8 3/4)
70
(2 7/8)
295
(11 5/8)
837
(33)
127
(5)
448
(17 3/4)
1,162
(45 3/4)
XBR-49X800E
KD-49X8000E
640
(25 1/4)
1,096
(43 1/4)
171
(6 3/4)
166
(6 5/8)
161
(6 3/8)
719
(28 3/8)
127
(5)
409
(16 1/8)
1,034
(40 3/4)
XBR-43X800E
KD-43X8000E
565
(22 1/4)
964
(38)
221
(8 3/4)
129
(5 1/8)
161
(6 3/8)
703
(27 3/4)
127
(5)
367
(14 1/2)
909
(35 7/8)
Screen center point

20 (GB)
Screw and Hook locations diagram/table
Model Name
A: Landscape, -20° leaning B: Landscape, +60° leaning C: Portrait, no leaning D: Portrait, +20° leaning
Screw
location
Hook
location
Screw
location
Hook
location
Screw
location
Hook
location
Screw
location
Hook
location
XBR-75X900E
KD-75X9000E d, j a — — d, j a — —
XBR-65X900E
KD-65X9000E d, g b — — d, g b — —
XBR-55X900E
KD-55X9000E d, g b — — d, g b — —
XBR-49X900E
KD-49X9000E f, j c — — f, j c — —
XBR-75X850E
KD-75X8500E d,gae,ja————
XBR-65X850E
KD-65X8500E e, j b d, g b d, g b d, g b
KD-55X8500E e, g c e, g c e, g c e, g c
XBR-55X800E e, g b e, g b e, j c e, j c
XBR-49X800E
KD-49X8000E f, j c f, j c e, g c e, g c
XBR-43X800E
KD-43X8000E ————f,gcf,gc
Screw location
When installing the Mounting Hook on the TV.
Hook location
When installing the TV onto the Base Bracket.
c
a
b