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a
a b
2
a b
2
b a b
2
a 2a b b
2
2
a c
a b a b c
2
a
2
a b
a c
a b c
2a b 2a c
2bc
2
b
2
bc c
2
bc
2
2
a
a b
ab
a b
b
b
a a b
a a b
2
a a b a b
2
b
2
a b
ab
a b
b
a a b a b
2
b
ab
b
2
2
a2 b2 a ba b
a b a 2ab b
2
2
2
a b c a b c
2ab 2ac 2bc
2
2
2
a b a b a b
2
2
2