Two cyclists are waiting at a crossing zone.
The two skateboards are waiting a cross zone.
cyclists and skateboards are different pieces of equipment
exists e1 e2 x1 x2.(at(e1,x2) & n_zone(x2) & Actor(e2,x2) & v_cross(e2) & Actor(e1,x1) & v_wait(e1) & n_cyclist(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_skateboard(x1) & card_eq_2(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wait(e1) & n_zone(x2) & of(x2,x3) & n_cross(x3))