two teenage girls take turns helping each other on the swings in the park.
The two girls are sisters.
Not all teenage girls are sisters.
exists e1 s1 x1 x2 x3 x5 x6.(n_park(x6) & n_swing(x5) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & all x4.(n_other(x4) -> exists e2.(in(e2,x6) & on(e2,x5) & Theme(e2,x4) & Actor(e2,x3) & v_help(e2))) & (x2 = x3) & n_turn(x2) & n_girl(x1) & a_teenage(s1) & Theme(s1,x1) & card_eq_2(x1))
exists p1 x1.(n_girl(x1) & card_eq_2(x1) & exists x2.((x1 = x2) & n_sister(x2)))