This article presents an apparent locality condition violation observed in Standard Breton masculine human plurals ending in -. It proposes a unique impoverishment rule deleting a syntacticosemantic feature conditioned by a specified phonological exponent. Adopting a specific architectural view of lenition, it forces a rethinking of the precise timing of various postsyntactic processes, including certain types of impoverishment rules as well as Agree-Copy in dissociated Agr nodes. It also lends support to the independent claims that syntacticosemantic features are not overridden during Spell-Out and that Vocabulary Insertion applies to a linearized structure, not a hierarchical one.

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