A child is looking at an exhibit.
A child is blind.
one child is looking at an exhibit while the other child is blind
exists e1 x1 x2.(at(e1,x2) & n_exhibit(x2) & Actor(e1,x1) & v_look(e1) & n_child(x1))
exists s1 x1.(Theme(s1,x1) & a_blind(s1) & n_child(x1))