Honda UMK422, UMK431 Owner's Manual
The engine exhaust from this product
contains chemicals known to the State
California
to
cause cancer, birth defects, or
other reproductive harm.
of
Keep this owner’s manual handy,
permanent part of the trimmer/brush cutter and should remain with the trimmer/brush cutter
so
you can refer to it at any time. This owner’s manual is considered a
if
resold.
The information and specifications included in this publication were in effect at the time of approval for
printing. Honda Motor
design at any time without notice and without incurring any obligation whatever.
Co.,
Ltd. reserves the right, however, to discontinue or change specifications or
No
part
of
this
publication may be reproduced without written permission.
INTRODUCTION
Congratulations on your selection of a Honda trimmer/brush cutter. We are certain you will be pleased
with your purchase of one of the finest trimmers/brush cutters on the market.
We want to help you get the best results from your new trimmer/brush cutter and to operate it safely.
This manual contains the information on how to do that; please read it carefully.
As
you read this manual, you will find information preceded by a symbol. That information is
intended to help you avoid damage to your trimmer, other property, or the environment.
We suggest you read the warranty policy to fully understand its coverage and your responsibilities of
ownership. The warranty policy is a separate document that should have been given to you by your
dealer.
When your trimmedbrush cutter needs scheduled maintenance, keep in mind that your Honda servicing
dealer is specially trained in servicing Honda trimmers/brush cutters. Your Honda servicing dealer is
dedicated to your satisfaction and will be pleased to answer your questions and concerns.
Best Wishes,
Honda Motor Co., Ltd.
1
INTRODUCTION
A
FEW WORDS ABOUT SAFETY
Your safety and the safety of others are very important. And using this trimmer/brush cutter safely is an
important responsibility.
To help you make informed decisions about safety, we have provided operating procedures and other
information on labels and in this manual. This information alerts you to potential hazards that could hurt
or
you
Of course, it is not practical
maintaining a trimmedbrush cutter. You must use your own good judgment.
others.
or
possible to warn you about all the hazards associated with operating or
You will find important safety information in
Safety Labels - on the trimmer/brush cutter.
Safety Messages - preceded by a safety alert symbol A and one of three signal words, DANGER,
WARNING, or CAUTION.
These signal words mean:
You WILL be KILLED or SERIOUSLY HURT if you don’t follow instructions.
You CAN be KILLED or SERIOUSLY HURT
You CAN be HURT if you don’t follow instructions.
Safety Headings - such as
Safety Section - such as
Instructions - how to use this trimmedbrush cutter correctly and safely.
This entire book is filled with important safety information
IMPORTANT SAFETY INFORMATION.
TRlMM€R
a
variety of forms, including:
SAFETY.
-
please read it carefully.
if
you don’t follow instructions.
2
CONTENTS
TRIMMER SAFETY
IMPORTANT SAFETY INFORMATION
ATTACHMENTS
Attachments
Modifications 5
IMPORTANT MESSAGE TO EMPLOYERS
SAFETY LABEL LOCATIONS
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RECOMMENDED CUTTING ATTACHMENTS ...
CUTTING-LINE HEADS AND SHIELD
Manual-Feed Cutting-Line Head
Semiautomatic (bump-feed) Cutting-Line Head
BLADES AND SHIELD
Grassweed Blades
Weed/Brush Blades
Brushwood Blades
Brushwood Blade Cover Installation and Removal
CUTTING ATTACHMENT APPLICATIONS
CONTROLS & EQUIPMENT
COMPONENT & CONTROL LOCATIONS
CONTROLS
Choke Lever
Ignition Switch
Operator Presence Lever
Throttle Trigger
Throttle Set Button
Priming Bulb
Recoil Starter Grip
EQUIPMENT
Shoulder Harness
Safety Glasses
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BEFORE OPERATION
ARE YOU READY
Knowledge
Physical and Mental Readiness
Protective Clothing
IS
YOUR WORKING AREA READY?
IS
YOUR TRIMMER READY TO GO?
Safety Inspection
Cutting Attachment Inspection
Maintenance Inspection 15
ARE YOUR SHOULDER HARNESS AND
TRIMMER CORRECTLY ADJUSTED?
Adjusting the Harness
Balancing the Trimmer on the Shoulder Harness
OPERATION
SAFE OPERATING PRECAUTIONS
STARTING THE ENGINE
STOPPING THE ENGINE
TRIMMER/HARNESS QUICK DISCONNECTION
TRIMMER OPERATION
Operating Position
Throttle Operation
Using a Nylon Cutting-Line Head
Using Blades
SAFE OPERATING PRACTICES
Thrown Debris
Blade Thrust (Kickback)
OPERATING TIPS
Scything
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&
MODIFICATIONS
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TO
OPERATE THE TRIMMER?
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OPERATION(continued)
Trimming and Edging
Brush Clearing
Operation on Slopes
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SERVICING YOUR HONDA TRIMMER ........... 24
THE IMPORTANCE OF MAINTENANCE
MAINTENANCE SAFETY
MAINTENANCE SCHEDULE
ENGINE
FUEL SYSTEM
CUTTING ATTACHMENTS
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Engine Oil Level Check
Engine Oil Change
Engine Oil Recommendations
Air Filter Inspection
Air Filter Cleaning
Spark Plug Service
Spark Arrester Service
Cooling Fin Inspection
Throttle Cable Inspection
Throttle Cable Adjustment
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Refueling
Fuel Recommendations
Fuel Filter and Fuel Tank Cleaning
Cutting-Line Heads
Blades
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STORAGE ........................................................ 41
STORAGE PREPARATION
Cleaning
Fuel
Engine Oil
Carburetor
Blade
Engine Cylinder
STORAGE PRECAUTIONS
REMOVAL FROM STORAGE
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&
Air Cleaner
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TRANSPORTING ............................................. 43
TAKING CARE
STARTING PROBLEMS
ENGINE OPERATING PROBLEMS
CUTTING HEAD PROBLEMS
OF
UNEXPECTED PROBLEMS
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TECHNICAL & CONSUMER INFORMATION
TECHNICAL INFORMATION
Serial Number Locations
Carburetor Modification for High Altitude Operation
Oxygenated Fuels
Emission Control System Information
Air Index
Specifications
CONSUMER INFORMATION
Honda Publications
Warranty Service Information
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QUICK REFERENCE
INFORMATION
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Inside back cover
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3
TRIMMER SAFETY
IMPORTANT SAFETY INFORMATION
Honda UMK422 and UMK431 trimmerdbrush
cutters are designed to cut grass, weeds, brush,
if
and/or wood
equipped with an appropriate
cutting attachment. Other uses can result in injury
to the operator or damage to the trimmer and
other property.
These Honda trimmers are intended for use by
gardening professionals. Never allow children to
operate the trimmer.
Most accidents can be prevented if you follow all
instructions in this manual and on the trimmer.
The most common hazards are discussed below,
along with the best way to protect yourself and
others.
Always Wear Eye Protection and Protective
Clothing
The most frequent injuries associated with
string trimmers are eye injuries caused by
thrown debris. Always wear safety glasses or
goggles that meet the
ANSI
287.1 rating
whenever you use the trimmer.
The operator must wear hearing protectors
when using this trimmer. Hearing protectors
will protect the operator’s ears from noise
damage.
Wearing protective clothing also reduces the
risk and severity of injury from thrown debris or
contact with the cutting attachment. Wear the
trimmer harness, gloves, a long-sleeved shirt,
long pants, and sturdy boots with nonslip
soles.
See page 14 for more information.
Keep Away From Cutting Lines and Blades
0
A
spinning cutting attachment can cut through
your clothes and skin just as easily as it cuts
through grass and brush. Keep all parts of your
body away from a spinning cutting attachment.
Off
Turn the Engine
0
If you stop trimming or cutting for any reason,
When Not Trimming
even to clean off the cutting attachment,
always shut off the engine.
Keep People Away From Your Working Area
To
prevent injury
least
50
feet
to
others, keep people at
(1
5
meters) away from the
working area during operation.
Always Wear the Harness When Trimming
The harness keeps the trimmer away from
your body, lowering your chances of being cut
by the trimmer’s blade or cutting line.
Read This Manual Before Using the Trimmer
Read the manual before operating the trimmer.
Understand how to use all the controls and
obey all warnings.
Clear the Working Area First
Objects thrown by the trimmer can cause
serious injury. Before operating the trimmer,
carefully inspect the area, and remove all
broken glass, pieces of wire, and other loose
objects.
Keep the Trimmer Properly Maintained
0
The cutting attachment should be examined for
looseness, cracks, broken parts, or excessive
wear. Tighten or replace as needed before
operating the trimmer.
0
Do
not operate the trimmer without a debris
shield properly installed. Make sure you have
the right shield installed for your cutting
attachment.
For more information, see page 7 and 8.
0
Even after the engine has stopped, the cutting
attachment will spin for several seconds.
Do
not touch it until it has stopped spinning, or you
may get cut.
4
TRIMMER
SAFETY
ATTACHMENTS & MODIFICATIONS
Modifying your trimmer/brush cutter, or installing
non-Honda attachments, can make your trimmer
unsafe. Before you make any modifications or
install any attachments, be sure to read the
following information.
Attachments
Your Honda trimmer servicing dealer has cutting
attachments, debris shields, barrier kits, and
shoulder harnesses that have been designed and
approved for your trimmer and are covered by
warranty.
Non-Honda attachments are usually designed for
universal applications. Although aftermarket
attachments may fit on your trimmer, they may
not meet factory specifications and could make
your trimmer unsafe.
Modifications
Do
not remove the debris shield or modify your
trimmer in any way that would alter its design or
operation. This could make your trimmer unsafe.
IMPORTANT MESSAGE TO EMPLOYERS
As an employer, you have special responsibilities
to the people who work for you.
Before you ask anyone to operate this trimmer/
brush cutter, you need to determine whether the
person is old enough, large enough, and strong
enough to safely handle and control the trimmer/
brush cutter.
If
you decide he or she is, make sure the
employee reads and understands all instructions
and warnings in this manual and on the labels
before operating the trimmer/brush cutter.
Allow adequate time for hands-on training by a
qualified instructor, and personally supervise
practice sessions, until you feel sure the
employee is ready to operate the trimmer/brush
cutter.
Also be sure employees wear proper clothing, eye
and hearing protection, and any other gear that
may be required by local ordinances or your
insurance company.
Remember, too, that you are responsible for
keeping the trimmer/brush cutter properly
maintained and in safe operating condition.
Your commitment to safety on the job can help
prevent accidents and result in longer and more
productive years of service.
5
TRIMMER SAFETY
SAFETY LABEL LOCATIONS
The labels shown here contain important safety information. Please read them carefully. These labels
are considered permanent parts of your trimmer/brush cutter. If a label comes off or becomes hard to
read, contact an authorized Honda servicing dealer for a replacement.
I
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A
WARNING
OWNERS
Failure to do
result
to the oDerator and
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bystanders.
MANUAL.
in
serious injury
so
can
u-
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(15m)
5011
A
WARNING
OBJECTS THROWN
SERIOUS INJURY.
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9
a
400)
u
CONTACT WITH ROTATING CUTTING ATTACHMENT CAN CAUSE SERIOUS INJURY.
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Keep away from rotating cutting attachment.
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Be aware
(See Owner's Manual for special operating precautions)
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Install proper shield, handle, and harness for cutting attachment.
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Use onlv Honda recommended cuttine attachments.
Always wear eye protection that meets ANSI 287.1.
I
Always wear hearing protection and protective clothing.
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Keep bystanders
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Do
not operate without shield.
A
WARNING
of
possible kickback when using blades.
BY
CUTTING ATTACHMENTS CAN CAUSE
at
least 50 feet (15m) away.
.
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6
TYPES
LOOP
EQUIPPED
HANDLE
WITH
RECOMMENDED CUTTING ATTACHMENTS
CUTTING-LINE HEADS AND SHIELD
A cutting-line head containing nylon monofilament
line, and a debris shield with cutoff knife is
standard equipment. The shield’s cutoff knife
automatically removes any excess line that is
released from the cutting head.
Honda UMK431 UNBA trimmers are supplied with
two different debris shields. Use the debris shield
with the cutoff knife when the cutting-line head is
installed.
Nylon monofilament line is suitable for cutting
grass and ordinary weeds, but not brush and
woody growth.
Manual-Feed Cutting-Line Head
CUTTING-LINE HEAD
\
DEBRIS SHIELD
MANUAL-FEED CUTTING-LINE HEAD
NYLON MONOFILAMENT LINE
I
Line is released from the cutting head by
manually pulling and turning the
spool
with the
trimmer stopped.
Semiautomatic (bump-feed) Cutting-Line Head
Line is released from the cutting head by bumping
the spool on hard ground during operation.
SEMIAUTOMATIC
(bump-feed)
CUTTING-LINE HEAD
7
RECOMMENDED CUTTING ATTACHMENTS
BLADES AND SHIELD BLADE DEBRIS SHIELD
A
variety of blades are available from your Honda
trimmer servicing dealer. Always use a debris
shield designed for use with a blade when
attaching a blade to your trimmer. This type of
debris shield does not have a cutoff knife.
Honda
a blade cover surrounding the edge of the blade.
For safety, and to protect the blade, the cover
should be installed whenever the trimmer is not in
use.
If
equipped with a loop handle, also install the
optional barrier kit that includes a full shoulder
harness, a barrier bar, and a debris shield for
metal blades. Follow the installation instructions
and safety information that come with the kit.
UMK431
installing a metal blade on a Honda trimmer
UNBA trimmers are supplied with
GRASSNEED BLADE,
WEED/BRUSH BLADE
DEBRIS SHIELD FOR
BRUSHNOOD BLADE
SHIELD FOR
BLADE
CUlTlNG LINE
DEBRIS SHIELD
p
I
CUTOFF KNIFE
BLADE
’/
Grassmeed Blades GRASSMEED BLADE
Grass/weed blades, which may be plastic or
metal, are used as an alternative to nylon
monofilament line for cutting grass and ordinary
weeds.
However, blades should never be used for edging
against solid surfaces.
Weed/Brush Blades
These metal blades have chisel-shaped teeth that
are used for cutting tough field grass, thick
weeds, and light brush. They are not designed for
sawing woody material. The teeth must be sharp
for good results.
BrushNood Blades
These metal saw-tooth blades are used for
sawing through saplings, shrubs, and woody
brush. The teeth must be sharp for good results.
Brush/wood blades will also cut grass and weeds,
but they are not efficient for that purpose.
WEEDlBRUSH BLADE
BRUSHNOOD BLADE
8
RECOMMENDED CUTTING ATTACHMENTS
Brush/Wood Blade Cover Installation and Removal
1.
Place the blade cover on the blade halfway,
starting with end A. To prevent the posts on
end A from interfering with the debris shield,
remove end A from the blade and place it
beside the blade as shown.
2.
Turn the blade slowly until end A is clear of the
debris shield.
3.
Replace end A on the blade.
4.
With the blade cover fully seated on the blade,
fasten the tab at end B on the post at end A.
Remove the blade cover in the reverse order of
installation.
CUTTING ATTACHMENT APPLICATIONS
DEBRIS SHIELD
END
\
6'
BLADE
\
ENDA
4
GRASS AND LIGHT WEEDS
THICK WEEDS AND LIGHT BRUSH
I
WOODY BRUSH, SHRUBS, SAPLINGS
Your Honda trimmer servicing dealer has cutting attachments that have been designed and approved
for your trimmer and are covered by warranty. Non-Honda attachments are usually designed for
universal applications. Although aftermarket attachments may fit on your trimmer, they may not meet
factory specifications and could make your trimmer unsafe.
OK
X
A
OK
X
X
0
OK
OK
X
X
X
OK
9
CONTROLS
COMPONENT & CONTROL LOCATIONS
CUTTING-LINE HEAD
&
EQUIPMENT
\
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GEAR CASE
LOOP HANDLE
ARNESS HANGER
DEBRIS SHIELD WITH
CUTOFF KNIFE OPERATORPRESENCELEVER
DRIVE SHAFT
HOUSING
IGNITION SWITCH
FUEL TANK
THROlTLE
SET
BUlTON
CHOKE LEVER SPARK PLUG CAP
fi
FUEL RETURN TUBE
[Jear)
FUEL SUPPLY TUBE
(black)
STARTER GRIP
A
UMK431 UNBA
(supplied with
cutting
and debris shields)
attachments
two
CUTTING-LINE HEAD
DEBRIS SHIELD
FOR BRUSHMOOD BLADE
e
DEBRIS SHIELD WITH
CUTOFF KNIFE
BLADE,
GEAR CASE
I
DRIVE SHAFT
HOUSING
THROlTLE
SET BUlTON
-HARNESS HANGER
U-TYPE
HANDLEBAR
10
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CONTROLS & EQUIPMENT
CONTROLS
Choke Lever
The choke lever opens and closes the choke
valve.
The CLOSED.position enriches the fuel mixture
for starting a cold engine.
The OPEN position provides the correct fuel
mixture for operation after starting, and for
restarting a warm engine.
Ignition Switch
The ignition switch controls the ignition system.
The ignition switch button must be in the ON
( I )
position for the engine to start and run.
CHOKE LEVER
U-type handle: Loop handle:
IGNITION SWITCH BUTTON
(0)
OFF
OFF
Moving the ignition switch button to the
(0)
position stops the engine.
Operator Presence Lever
The operator presence lever blocks the throttle
trigger. This safety feature prevents unintentional
if
throttle operation
the trimmer is bumped while
the operator’s hand is not on the control handle.
When the operator presses the presence lever by
gripping the control handle, the trigger moves
freely.
Throttle Trigger
The throttle trigger controls engine speed.
Pulling the throttle trigger toward the grip
increases engine speed. The trimmer will have
the greatest cutting force at maximum engine
speed.
Releasing the throttle trigger reduces engine
speed. At idle, the cutting-line head or blade
should coast to a stop.
K//
IGNITION SWITCH BUTTON
..
FAST‘
’
”
(cutting
attachment
rotates)
QP
\
11
CONTROLS
&
EQUIPMENT
Throttle Set Button
The throttle set button is used to hold the throttle
trigger at the fast idle position for starting.
Do
not
allow the cutting line or blade to contact any
obstruction when starting the engine with the
throttle button engaged
To engage the throttle set button, press the
operator presence lever by gripping the control
handle, pull the throttle trigger, then press and
hold the throttle set button while releasing the
throttle trigger.
To disengage the throttle set button, simply pull
the throttle trigger. The throttle set button
automatically disengages when the throttle trigger
is pulled.
Do
not use the throttle set button while operating
the trimmer. The trimmer will not return to idle,
or
and the cutting-line head
blade will continue to
spin, until the set button is disengaged and the
throttle trigger is released.
THROlTLE
SET BUlTON
OPERATOR
PRESENCE
LEVER
FUEL RETURN TUBE
(clear plastic tube)
Priming
Bulb
Pressing the priming bulb pumps fuel from the
fuel tank to the carburetor. This procedure is
necessary for starting the engine.
To ensure that fuel has reached the carburetor,
press the priming bulb repeatedly until fuel can be
seen in the clear-plastic fuel-return tube.
Recoil Starter Grip
Pulling the starter grip operates the recoil starter
to turn the engine for starting.
PRIMING
12
CONTROLS & EQUIPMENT
EQUIPMENT
Honda UMK422 and UMK431 trimmerdbrush
cutters are supplied with a shoulder harness and
safety glasses. Refer to page 14 for a description
of other equipment and protective clothing you will
need.
Shoulder Harness
A
full shoulder harness must be worn by the
operator of these Honda trimmers/brush cutters
when equipped with a blade and debris shield.
If
the trimmer is equipped with a cutting-line head
and shield with cutoff knife, the operator may
wear a single-strap harness.
A
suitable shoulder harness is supplied with each
new Honda UMK422 and UMK431 trimmer/brush
cutter. Replacement shoulder harnesses may be
purchased through any authorized Honda
trimmedbrush cutter servicing dealer.
FULL SHOULDER HARNESS
n
QUICK-RELEASE
SINGLE-STRAP SHOULDER HARNESS
LATCH
Before operation, adjust your shoulder harness as
described on page 16.
Quick-Release
Latch
The shoulder harnesses supplied with these
trimmers are equipped with a quick-release latch.
Pull the latch tab upward to detach the trimmer
from the harness.
insert the latch tongue in the slot of the quickrelease latch to reattach the trimmer
to
the
harness.
Safety Glasses
Safety glasses or goggles that comply with
ANSI
standard 287.1 must be worn by the operator of
any Honda trimmer/brush cutter. The safety
glasses supplied with each new Honda UMK422
and UMK431 trimmedbrush comply with the
ANSI
standard.
QUICK-RELEASE
QUICK-RELEASE
SAFETY GLASSES (ANSI
LATCH
LATCH TAB
LATCH
287.1)
13
ARE YOU READY TO OPERATE THE TRIMMER?
Your safety is your responsibility. A little time
spent in preparation will significantly reduce your
risk of injury.
Knowledge
Read and understand this manual. Know what the
controls do and how to operate them.
Familiarize yourself with the trimmer and its
operation before you begin to use it. Know what
to do in case of emergencies.
Physical and Mental Readiness
You must be alert and in good physical condition
to operate the trimmer.
trimmer if you are tired,
of alcohol, medication, or any substance that
might impair your vision, dexterity,
If
you have any physical problem that may be
aggravated by strenuous work, consult your
physician before operating the trimmer.
Do
not operate the
ill,
or under the influence
or
judgment.
Hearing Protection
Hearing protectors will help to protect your ears
from noise. Earmuff-style hearing protectors can
also protect your ears from thrown objects.
Hand and Body Protection
Wear gloves, a long-sleeved shirt, and long pants
made of heavy material. Clothing should fit
closely but allow freedom of movement, and
should have no strings, straps, etc. that could
catch on brush or the trimmer. Keep clothing
fastened.
Foot
Protection
Wear sturdy work boots with good toe protection
and nonslip soles.
Protective Clothing
Wearing protective clothing will reduce your risk
of injury. Do not wear loose clothing, jewelry,
short pants, sandals, or go barefoot. Secure hair
so
it is above shoulder level.
Eye, Face, and Head Protection
Always wear safety glasses or goggles that
comply with ANSI standard
eyes from thrown objects. Prescription glasses
may be worn under the safety glasses or goggles.
A helmet with a face shield is recommended for
further protection. However, safety glasses or
goggles should always be worn under the face
Do
shield.
protect your eyes.
Wearing a dust mask will help to reduce the
amount of pollens and dust inhaled.
not rely on a face shield alone to
287.1
to protect your
IS
YOUR
Objects thrown by the trimmer can cause serious
injury. Before operating the trimmer, carefully
inspect the area, and remove all objects that
could be thrown by, or entangled in
attachment, such as rocks, broken glass, nails,
wire, or string.
Clear the area of children, bystanders, and pets.
Keep all children, bystanders, and pets at least
feet
being operated.
Even outside a 50-foot
trimmer, there may be a risk of injury from thrown
objects,
wear eye protection.
If anyone approaches you while you are operating
the trimmer, release the throttle trigger and stop
the engine.
WORKING
(15
meters) away from where the trimmer is
so
bystanders should be encouraged to
AREA READY?
,
the cutting
(1
5-meter) radius of the
50
14
IS
YOUR
TRIMMER READY TO
BEFORE OPERATION
GO?
For your safety, and to maximize the service life
of your equipment, it is very important to take a
few moments before you operate the trimmer to
check its condition. Be sure to take care of any
problem you find, or have your servicing dealer
correct it, before you operate the trimmer.
Improperly maintaining this trimmer, or
failing to correct a problem before
operation, could cause a malfunction in
which you could be seriously injured.
Always perform a preoperation inspection
before each operation, and correct any
problem.
Safety Inspection
Look around the engine for signs of oil or
gasoline leaks. Wipe up any spills before
starting the engine.
Cutting Attachment Inspection
Look for signs of damage to the cutting
33
and
39).
attachment (see pages
any cutting attachment and parts that are worn
out, bent, cracked, chipped, or damaged in any
way.
If
using a metal blade, be sure it is sharp.
dull blade is more likely to snag and thrust.
If
using a metal blade on a trimmer equipped
with a loop handle, be sure the barrier bar
(optional part) is installed beneath the loop
handle.
Make sure the cutting attachment is properly
installed and securely fastened (see pages
and
40).
Check that the debris shield is the correct
shield for the cutting attachment (see page
and that it is securely installed and in good
condition.
Replace
A
38
9),
Replace any damaged parts.
Check that all fasteners are in place and
secure. Tighten as necessary.
Maintenance Inspection
Check the oil level (see page
engine with a low oil level can cause engine
damage.
Check the air filter (see page
filter will restrict air flow to the carburetor,
reducing engine and trimmer performance.
Check throttle cable free play (see page
The cable must be correctly adjusted and
operate smoothly for good throttle control.
Check the fuel level (see page
with a full tank will help to eliminate or reduce
operating interruptions for refueling.
26).
Running the
27).
A
31).
Starting
dirty air
30).
15
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