Several young children on an inflatable device.
They are bouncing on a bouncy castle.
Not every inflatable device is a bouncy castle.
exists s1 s2 s3 x1 x2.(a_topic(x1) & on(x1,x2) & n_device(x2) & a_inflatable(s3) & Theme(s3,x2) & n_child(x1) & a_young(s2) & Theme(s2,x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2.(on(e1,x1) & n_castle(x1) & of(x1,x2) & n_bouncy(x2) & Actor(e1,x1) & v_bounce(e1) & n_thing(x1))