Four children looking through rolled up booklets.
The children are in a library.
The sentence never says where they are so we don't know if its a library.
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 p1 x1.(n_child(x1) & exists x2.(in(x1,x2) & n_library(x2)))