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aX16

bX16

cX16

STEP 1

aX12

bX12

cX12

STEP 2

STEP 3

STEP 4

STEP 5

1

 

2

2

2

2

3

4

 

4

 

4

 

5

6

7

 

X2

X2

a

b

c

a

b

c

a

b

c

a

b

c

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