two fighters kickboxing
Two fighters are kickboxing.
Two fighters  kickboxing implies fighters are kickboxing
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_kickbox(e1) & (x1 = x2) & n_fighter(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_kickbox(e1) & n_fighter(x1) & card_eq_2(x1))