for (ppl_Pointset_Powerset_C_Polyhedron_iterator_begin (ps, it),
ppl_Pointset_Powerset_C_Polyhedron_iterator_end (ps, end);
!ppl_Pointset_Powerset_C_Polyhedron_iterator_equal_test (it, end);
for (ppl_Pointset_Powerset_C_Polyhedron_iterator_begin (ps, it),
ppl_Pointset_Powerset_C_Polyhedron_iterator_end (ps, end);
!ppl_Pointset_Powerset_C_Polyhedron_iterator_equal_test (it, end);