A group of teenagers stand and sit on a house porch.
Some teenagers are standing and some are sitting on a porch.
It can be inferred that some teenagers are standing and some are sitting.
exists e1 e2 x1 x2 x3 x4 x5 x6.(on(e2,x5) & n_porch(x5) & of(x5,x6) & n_house(x6) & Actor(e2,x3) & v_sit(e2) & of(x3,x4) & n_teenager(x4) & n_group(x3) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_teenager(x2) & n_group(x1))
exists e1 e2 x1 x2 x3.(on(e2,x3) & n_porch(x3) & Actor(e2,x2) & v_sit(e2) & n_thing(x2) & Actor(e1,x1) & v_stand(e1) & n_teenager(x1))