if (List.length uris < (Filter_auto.power 2 (List.length (NewConstraints.StringSet.elements all_const))))
then
(prerr_endline("metodo vecchio");List.filter (Filter_auto.filter_new_constants conn all_const) uris)
if (List.length uris < (Filter_auto.power 2 (List.length (NewConstraints.StringSet.elements all_const))))
then
(prerr_endline("metodo vecchio");List.filter (Filter_auto.filter_new_constants conn all_const) uris)