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S 1 2 a b

S 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a b
S 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a b
S 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a bS 1 2 a b