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A2 b c b2 c a c2 a b 1
A2 b c b2 c a c2 a b 1 pictures 5
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A2 b c b2 c a c2 a
A2 b c b2 c a c2 a b 1
a b c b c a c a b 1 prove that a2 b c b2 c a c2 a b 0
a2 b c b2 c a c2 a b 1
