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F x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a b
F x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a bF x 0 x a b