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STEP 1

STEP 2

STEP 3

STEP 4

X2

b

x 2

c

c

c

e

e

e

c

c

c

D

X12

X6

x 2

a

a

a

a

a

a

a

a

a

a

D

X20

E

d

d

d

d

a

a

a

a

A

X4

X4

E

b

b

D

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