A number of colorful balls hide children.
The children cover themselves in balls while playing in the restaurant's playpen.
Children hiding in balls does not mean they are playing.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_hide(e1) & n_child(x3) & of(x1,x2) & n_ball(x2) & a_colorful(s1) & Theme(s1,x2) & n_number(x1))
exists e2 e1 x1 x2 x3 x4 x5.(n_playpen(x5) & of(x5,x4) & n_restaurant(x4) & n_group(x2) & n_child(x1) & while(e1,e2) & in(e2,x5) & Actor(e2,x1) & v_play(e2) & in(e1,x3) & n_ball(x3) & Theme(e1,x2) & Actor(e1,x1) & v_cover(e1))