Semigroup action
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Free monoid
Process calculus
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Empty string
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Syntactic monoid
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Monad (functional programming)
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Lexicographic order
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Free algebra
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Thue–Morse sequence
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Rewriting
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Polynomial ring
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Semiring
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List of abstract algebra topics
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Free object
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List (abstract data type)
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Graded ring
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Concatenation
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Formal power series
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Sequence
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String (computer science)
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Semigroup
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Regular language
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Monoid
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Kleene star
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Homomorphism
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Formal language
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Free Semigroup
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