  (N=2)-superspace without torsion is described, which is equivalent to an
8-space with a discrete internal subspace. A number and a character of ties
determine now an internal symmetry group, while in the supersymmetrical models
this one is determined by an extension degree N. Such a model can be
constructed for no less than 4 generations of the two-component fundamental
fermions. Analogues of the Higgs fields appear in the model naturally after
transition to the Grassmannian extra coordinates. The connection between
discrete and continues internal symmetries of the model is discussed. If one
considers gravity as embedding the curved 4-space into a 12-dimensional flat
space, a U(1)-symmetry appears transformations of which should be connected
with the ones of SU(2)-group. If super-strong interacting gravitons are
constituents of the composite fermions, all this may open us another way to
unify the known interactions. The main feature of this new approach may be the
external see of gravitons underlying an internal structure of particles; the
lack of any divergencies would be due the Planckian spectrum of external
gravitons.
