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O
O  0 = 0  (pos 1)
O

O
X  2 = 1  (pos 2)
O

O
O    = 2  (pos 3)
X  1

O
X  2 = 3  (pos 4)
X  1

X  3
X  2 = 4  (pos 5)
O

X  3
O    = 5  (pos 6)
X  1

X  3
X  2 = 6  (pos 7)
X  1