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" ... Changing particles for antiparticles and reflecting them in a mirror simultaneously represents CP... [+] symmetry. If the anti-mirror decays are different from the normal decays, CP is violated. Time reversal symmetry, known as T, must beviolated if CP is violated. The combined symmetries of C, P, and T, all together, must be conserved under our present laws of physics, with implications for the types of interactions that are and aren't allowed. ... "