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STEP 1

STEP 1

STEP 2

STEP 3

STEP 4

X6

X6

a

a

a

a

a

f

a

D

D

D

C

B

C

B

D

D

D

C

B

a

a

a

a

a

a

C

B

X6

180°

f

f

f

f

f

f

f

f

f

f

f

X6

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