Four boys playing on the inertia wheel at a park.
The boys are sleeping inside the cabin.
They can't sleep in a cabin and play on an inertia wheel at the park at the same time.
exists e1 x1 x2 x3 x4 x5.(n_wheel(x3) & of(x3,x4) & n_inertia(x4) & a_topic(x1) & at(e1,x5) & n_park(x5) & on(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1) & card_eq_4(x1))
exists e1 x1 x2.(n_cabin(x2) & n_boy(x1) & inside(e1,x2) & Actor(e1,x1) & v_sleep(e1))