Three men ride horses by a fence.
Three men are walking along the fence line.
ride horses is contradictory to walking
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & by(x2,x3) & n_fence(x3) & n_horse(x2) & n_man(x1) & card_eq_3(x1))
exists e1 x1 x2 x3.(n_line(x2) & of(x2,x3) & n_fence(x3) & along(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1) & card_eq_3(x1))