# Concept derivation guides

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

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Concept guide



## [A scan decider for an even number of ones](/en/derivations/derivation-mko-turing-machine-decision-model-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-turing-machine-decision-model)

Give the complete machine, trace, ranking and all-input correctness.

Turing-machine decision model

derivation-mko-turing-machine-decision-model-01





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