Two men are sitting on the ground and going through their backpacks.
Two school boys are looking through their backpacks.
Just because two men are sitting on the ground and going through their backpacks doesn't needed to be school boys
exists e2 e1 x1 x2 x3 x4.(n_backpack(x4) & of(x4,x2) & n_thing(x2) & n_ground(x2) & through(e2,x4) & Actor(e2,x3) & v_go(e2) & n_man(x3) & card_eq_2(x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(through(e1,x3) & n_backpack(x3) & of(x3,x1) & n_thing(x1) & Actor(e1,x1) & v_look(e1) & n_boy(x1) & of(x1,x2) & n_school(x2) & card_eq_2(x1))