two football players tackle another football player.
Humans tackling.
Football players are humans. For players to tackle another player, they're tackling.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_tackle(e1) & n_player(x4) & of(x4,x5) & n_football(x5) & -(x4 = x1) & n_player(x1) & n_player(x1) & of(x1,x3) & n_football(x3) & of(x1,x2) & n_football(x2) & card_eq_2(x1))
exists s1 x1 x2.(n_tackling(x1) & a_.(s1) & Theme(s1,x1) & (x1 = x2) & ne_nam_humans(x2) & a_topic(x1))