Four dirt bike riders are riding on a dirt road.
Three men drive cars in a line.
There are either four dirt bike rider or three men. They are either driving cars or riding dirt bikes as it cannot be both.
exists e1 x1 x2 x3 x4 x5.(on(e1,x4) & n_road(x4) & of(x4,x5) & n_dirt(x5) & Actor(e1,x1) & v_ride(e1) & n_rider(x1) & of(x1,x3) & n_bike(x3) & of(x1,x2) & n_dirt(x2) & card_eq_4(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_line(x3) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_car(x2) & n_man(x1) & card_eq_3(x1))