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A model of computation common mistakes
Study A model of computation with curriculum-aligned Common Mistakes resources, practice links, and exam-focused support.
At a glance
common mistakes
Resource type
Topic
A model of computation
AqaA LevelComputer ScienceTheory of computation
Common mistakes
Confusing the symbol read with the symbol written
Treating both symbols in a transition rule as the same, or assuming that the machine moves before writing.
Fix itRead the rule in order: identify the current state and symbol read, then apply the new state, write the specified symbol and move in the specified direction.
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