Four young children perform a martial art.
The children are getting exercise
perform a martial art is a form of getting exercise
exists e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_art(x2) & a_martial(s2) & Theme(s2,x2) & n_child(x1) & a_young(s1) & Theme(s1,x1) & card_eq_4(x1))
exists e1 x1 x2.(n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_get(e1) & n_exercise(x2))