Three kids on a scooter with three wheels.
The kids are on a wagon with six wheels.
One cannot be on a wagon and on a scooter at the same time.
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & with(x2,x3) & n_wheel(x3) & card_eq_3(x3) & n_scooter(x2) & n_kid(x1) & card_eq_3(x1))
exists p1 x1.(n_kid(x1) & exists x2 x3.(on(x1,x2) & with(x2,x3) & n_wheel(x3) & card_eq_6(x3) & n_wagon(x2)))