+ NCicEnvironment.add_constraint true (mk_type 2) (mk_type 3);
+ NCicEnvironment.add_constraint true (mk_cprop 2) (mk_cprop 3);
+ NCicEnvironment.add_constraint true (mk_cprop 2) (mk_type 3);
+ NCicEnvironment.add_constraint true (mk_type 2) (mk_cprop 3);