FUNCTION: LieTools/UgMkPBWZeroWgts
USAGE: UgMkPBWZeroWgts(n);
SYNOPSIS: UgMkPBWZeroWgts(n) produces a list of the zero weight 
  monomials in U[g] of order n with respect to a PBW basis.
CAVEATS: requires a previously initialized global Lie algebra environment.
  (See LieTools[gSetup].)
EXAMPLE: 
> gSetup(G,2);
Setting up Gtype = G   rnk = 2
> UgMkPBWZeroWgts(2);

  {u(g[4], g[11]), u(g[2], g[13]), u(g[3], g[12]), u(g[6], g[9]),

        u(g[5], g[10]), u(g[7], g[8]), u(g[1], g[14]), u(g[7], g[7]),

        u(g[8], g[8])}

SEE ALSO: 
