# show all combinations of (A,B,C) (a,b,c) and (1,2,3)
print join("\n",
  nestedmap {
    nestedmap {
      nestedmap {
        join('',@NestedMap::stack[0..2])
      } qw(A B C)
    } qw(a b c)
  } qw(1 2 3)
);