SemiconjBy.mul_left

∀ {S : Type u_1} [inst : Semigroup S] {a b x y z : S}, SemiconjBy a y z → SemiconjBy b x y → SemiconjBy (a * b) x z

If b semiconjugates x to y and a semiconjugates y to z, then a * b semiconjugates x to z.

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