Principles for laying out GPU's integrated circuits? (5)

I believe the answer is:

logic

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'principles for' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for logic that I've seen before include "Strict reasoning" , "4-ing" , "The science of reasoning correctly" , "Science of correct reasoning" , "Reasoned argument" .)

I've seen this clue in The Independent.

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