Two girls stand in a puddle on a sidewalk.
Two sisters are playing in a puddle.
Just because two girls are standing in a puddle does not mean they are sisters or playing in the puddle.
exists e1 x1 x2 x3.(on(e1,x3) & n_sidewalk(x3) & in(e1,x2) & n_puddle(x2) & Actor(e1,x1) & v_stand(e1) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2.(in(e1,x2) & n_puddle(x2) & Actor(e1,x1) & v_play(e1) & n_sister(x1) & card_eq_2(x1))