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STEP 4

X12

X1

X2

X2

X4

X10

c

c

c

c

C

Gx2

f

e e

c

c

c

c

d

d

d

d

C

G

G

n

F

d

d

n

c

c

c

c

c

c

c

c

c

c

d

J

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