A toddler is in a green playpen.
The toddler is playing in a playpen.
A playpen is something a toddler plays in.
exists p1 x1.(exists s1 x2.(in(x1,x2) & n_playpen(x2) & a_green(s1) & Theme(s1,x2)) & n_toddler(x1))
exists e1 x1 x2.(n_toddler(x1) & in(e1,x2) & n_playpen(x2) & Actor(e1,x1) & v_play(e1))