Four children looking through rolled up booklets.
Some children are looking through something.
Some children could mean less then 4. Stating they are looking through something could be anything else then a booklet. Could be a book, magazine, newspaper,  website.
exists e1 e2 s1 x1 x2.(through(e1,x2) & n_booklet(x2) & a_up(s1) & Theme(s1,x2) & Theme(e2,x2) & v_roll(e2) & Actor(e1,x1) & v_look(e1) & n_child(x1) & card_eq_4(x1))
exists e1 x1 x2.(through(e1,x2) & n_thing(x2) & Actor(e1,x1) & v_look(e1) & n_child(x1))