# Concept derivation guides

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

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Concept guide



## [A parity invariant for arbitrary word length](/en/derivations/derivation-mko-regular-language-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-regular-language)

All words over {0,1} with an even number of 1s form a regular language.

Regular language

derivation-mko-regular-language-01





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