“…systems such as FASILL [12] and Bousi∼Prolog [13], [14], which has been employed in several applications such as text classification [15], [16], linguistic feedback in computer games [17], decision making [18], [19], and knowledge discovery [20]. Aït-Kaci and Pasi [21] have presented a procedure for weak unification that, besides tolerating different (but similar) functor symbols, also allows the unification of FOTs with a different number and possibly a different order of arguments.…”