Two men are sitting on the ground and going through their backpacks.
The guys are sitting on the lawn outside.
Just because two men are sitting on the ground and going through their backpacks doesn't mean they are on the lawn outside.
exists e1 e2 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.(n_outside(x2) & of(x2,x3) & n_lawn(x3) & n_guy(x1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))