. We can now rewrite n as co 00 n = dr21 e-373 -721/(73, T2)IZ(T3) z(r2 1-3)+ z(r2 + r3)]dr3 (4.70) The only quantity we need to compute is y(r3, r2). Let us assume that i and j coalesce first, and then they coalesce with I. As before, in order for i and j to have the same strategy, the tota