  In this paper, as in our previous "Descent-cycling in Schubert calculus"
math.CO/0009112, we study the structure constants in equivariant cohomology of
flag manifolds G/B. In this one we give a recurrence (which is frequently, but
alas not always, positive) to compute these one by one, using the non-complex
action of the Weyl group on G/B.
  Probably the most noteworthy feature of this recurrence is that to compute a
particular structure constant c_{lambda,mu}^nu, one does not have to compute
the whole product S_lambda * S_mu.
