Two martial artists spar while a referee wearing a tie looks on.
The referee is wearing a tie.
The referee is the person wearing the tie.
exists e1 p1 s1 x1.(exists e3 e2 p2 x2 x3 x4.(exists s2.(Theme(s2,x2) & a_on(s2)) & Topic(e3,p2) & Actor(e3,x2) & v_look(e3) & Theme(e2,x4) & Actor(e2,x3) & v_wear(e2) & n_tie(x4) & (x2 = x3) & n_referee(x2)) & while(e1,p1) & Actor(e1,x1) & v_spar(e1) & n_artist(x1) & a_martial(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2.(n_referee(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_tie(x2))