Three men sit on top of a green tank.
The three men are on top of a tree.
The men cannot be sitting on top of a green tank and on top of a tree simultaneously.
exists e1 s1 x1 x2 x3.(on(e1,x2) & of(x2,x3) & n_tank(x3) & a_green(s1) & Theme(s1,x3) & n_top(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & card_eq_3(x1))
exists p1 x1.(n_man(x1) & card_eq_3(x1) & exists x2 x3.(on(x1,x2) & of(x2,x3) & n_tree(x3) & n_top(x2)))