One more test for the de facto Prolog standard `numbervars/3` predicate
One more test for the de facto Prolog standard `numbervars/3` predicate

LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3