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is called the wug test.)
*Untaught and subconscious: Speakers apply these rules without being aware of it, and they acquire the rules early in life without any explicit teaching.
*Intuitive: The rules give speakers intuitions about what words are "well-formed" or "acceptable"; if a speaker hears a word that does not conform to the language's phonological rules, the word will sound foreign or ill-formed.

Types

Phonological rules can be roughly divided into four types:
*Assimilation:

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