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Part C1 Sanitary Plumbing Systems (Performance Requirements)Part C1 Sanitary Plumbing Systems (Verification Methods)Part C1 Sanitary Plumbing Systems (Deemed-to-Satisfy)Part C2 Sanitary Drainage Systems (Performance Requirements)Part C2 Sanitary Drainage Systems (Verification Methods)Part C2 Sanitary Drainage Systems (Deemed-to-Satisfy)