  It is shown that the four trefoil solitons that are described by the
irreducible representations D^{3/2}_{mm'} of the quantum algebra SL_q(2) (and
that may be identified with the four families of elementary fermions
(e,\mu,\tau;\nu_e\nu_\mu\nu_\tau;d,s,b;u,c,t) may be built out of three preons,
chosen from two charged preons with charges (1/3,-1/3) and two neutral preons.
These preons are Lorentz spinors and are described by the D^{1/2}_{mm'}
representation of SL_q(2). There are also four bosonic preons described by the
D^1_{mm'} and D^0_{00} representations of SL_q(2). The knotted standard theory
may be replicated at the preon level and the conjectured particles are in
principle indirectly observable.
