Two men wearing a hat are holding on to their bikes.
Two men are riding bikes.
two men holding their bikes does not imply they are riding it.
exists e2 e1 x1 x2 x3 x4.(r_on(e2) & to(e2,x4) & n_bike(x4) & of(x4,x1) & n_thing(x1) & Actor(e2,x1) & v_hold(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_hat(x3) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_man(x1) & card_eq_2(x1))