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Structure-changing rule

PHONOLOGY/MORPHOLOGY: a rule which changes already specified information, and renders the output form distinct from the input. EXAMPLE: the feature [voice] is distinctive within the class of obstruents, but non-distinctive in the class of sonorants. If there is a rule which devoices obstruents in a particular environment, say word final, this rule will be structure-changing if it changes [-son, +voice] into [-son, -voice].
LIT. Archangeli, D. (1984)
Kiparsky, P. (1982)