Because Gell-Mann could find in the Baryon-Meson-SEXTETT (Neutron-Proton-Pion-Antineutron-Antiproton-Kaon-Neutron) only 6 Triangles.  And their Points of Gravidity are the 6 Quarks, where each Triangle with the opposite Triangle represents a Quark Family.

Therefore the classical Particle Physic knows only 3 Generations of matter.

The gray matter Physik may find more.

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