# Concept derivation guides

299 concept teaching guides, separate from the 36,000 individual question derivations.

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Concept guide



## [Star closure with epsilon and a complete length slice](/en/derivations/derivation-mko-regular-expression-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-regular-expression)

Give typed AST semantics, complete bounded enumeration and membership obligations.

Regular expression

derivation-mko-regular-expression-01





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