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The chisel. lib/maude/matching.sx: multi-valued matcher mau/mm returning ALL substitutions, dispatching on op theory (free/comm/assoc/AC). Identity lets variables grab empty blocks. AC-canonical form (mau/canon) powers ac-equal? and deterministic printout. AC rewriting extends f-AC equations with rest vars so a rule fires on any sub-multiset/subword; mau/first-change only commits rewrites that change the canonical form (idempotency/identity terminate). Verified on multiset rewriting, set theory, group equations. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>