Three kids on a scooter with three wheels.
The scooter with four wheels was no fun for the two boys.
The scooter can only have three or four wheels.
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 x2 x4.(n_boy(x4) & card_eq_2(x4) & n_scooter(x1) & -exists x3.((x1 = x3) & for(x3,x4) & n_fun(x3)) & with(x1,x2) & n_wheel(x2) & card_eq_4(x2))