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the following flavour quantum numbers:
* The third component of isospin (usually just "isospin") (), which has value {{mvarsub|3}} =}} sfrac|1|2}} }} for the up quark and {{mvarsub|3}} =}} −sfrac|1|2}} }} for the down quark.
* Strangeness : Defined as {{mvar =}} −mvar|n}}sub| s}} + mvar|n}}sub| s̅}} ,}} where represents the number of strange quarks and represents the number of strange antiquarks . This

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