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Ah, thanks.

"CPT Symmetry" https://en.wikipedia.org/wiki/CPT_symmetry

"CP Violations" https://en.wikipedia.org/wiki/CP_violation

"Charm quark" https://en.wikipedia.org/wiki/Charm_quark :

> The antiparticle of the charm quark is the charm antiquark (sometimes called anticharm quark or simply anticharm), which differs from it only in that some of its properties have equal magnitude but opposite sign.

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