Two men are riding horses and trying to lasso a cow.
Two men are on white horses
Not all horses are white.
exists e2 e1 p1 x1 x2 x3.(Topic(e2,p1) & Actor(e2,x3) & v_try(e2) & exists e3 x4.(Theme(e3,x4) & Actor(e3,x3) & v_lasso(e3) & n_cow(x4)) & n_man(x3) & card_eq_2(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2) & n_man(x1) & card_eq_2(x1))
exists p1 x1.(exists s1 x2.(on(x1,x2) & n_horse(x2) & a_white(s1) & Theme(s1,x2)) & n_man(x1) & card_eq_2(x1))