  It is proposed that each quark is composed of two prequarks, called primons.
This composition generates a new hypercharge and a new kind of color called
supercolor. Such quark composition explains the Kobaiashi-Maskawa matrix
elements in terms of selection rules based on the new hypercharge. Also it is
shown that the doublet of quarks top/bottom is quite similar to the doublet
charm/strange. Besides, it is also shown that there should exist three Higgs
bosons involved in the generation of quark masses.
