  We had previously used techniques involving isospin to count the number of
states for three identical fermions in a single j shell with total angular
momentum I=j. We generalize this to all I, but the main thrust of this work is
to consider now a 4-fermion system. As before, one evaluates the eigenvalues of
the Hamiltonian \sum_{i<j}[a + bt(i)t(j)] both from an isospin point of view
and an angular momentum point of view. In the 4-particle case, we get a more
limited result than in the 3-particle case, namely the number of T=0 states
minus twice the number of T=2 states, all of a given angular momentum I.
