If F is a free semigroup on a set S, then the concatenation of two eve – McqOptions

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1.	If F is a free semigroup on a set S, then the concatenation of two even words is ________
A.	a semigroup of F
B.	a subgroup of F
C.	monoid of F
D.	cyclic group of F
Answer» C. monoid of F

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