Young children at a martial arts competition, at a school gymnasium.
Children are in a gym.
in a both sentence competition and gym is different
exists s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & at(x1,x4) & n_gymnasium(x4) & of(x4,x5) & n_school(x5) & at(x1,x2) & n_competition(x2) & of(x2,x3) & n_art(x3) & a_martial(s2) & Theme(s2,x2) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_gym(x2)) & n_child(x1))