# 4.7: Phonological Derivations

- Page ID
- 9656

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Using the notation of feature matrices, we can create “formulas” that represent the relationship between the phonemic and phonetic levels of representation in our mental grammar. These formulas are known as phonological derivations or phonological rules, and they are meant to represent the unconscious knowledge that every fluent speaker has about the predictable environments where allophonic variation occurs in their language.

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