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** a single up or down quark together with two additional quarks of higher flavour Xi baryon
** an up quark, a down quark, and either an up or a down quark nucleons. Note that three identical quarks would be forbidden by the Pauli exclusion principle due to requirement of anti-symmetric wave function
* Particles of total isospin 0 can be made from
** a neutral quark-antiquark pair: or ) + c_2(\mathrm{s\bar{s}})

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