A group of girls playing a game on horseback.
The horses are sleeping.
Horses would not be able to sleep while a group of girls are seated on them playing a game.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & on(x4,x5) & n_horseback(x5) & n_game(x4) & (x1 = x3) & of(x1,x2) & n_girl(x2) & n_group(x1))
exists e1 x1.(n_horse(x1) & Actor(e1,x1) & v_sleep(e1))