  Spinless fermions on a lattice with nearest-neighbor repulsion serve as a toy
version Hubbard model, and have a symmetry-broken even/odd superlattice at
half-filling. At infinite repulsion, doped holes form charged stripes which are
antiphase walls (as noted by Mila in 1994). Exact-diagonalization data for
systems up to 36 sites around 1/4 filling, and also for one or two holes added
to a stripe of length up to 12, indicate stability of the stripe-array state
against phase separation. In the {\it boson} version of the model, the same
behavior can be stabilized by addition of a four-fermi term.
