Four teenagers, three girls and one boy, are jumping in the air on a sidewalk by the river.
Four teenagers playing by the river.
Just because they are jumping in the air, doesn't mean they are playing. They could be trying to reach something.
exists e1 x1 x2 x3 x4 x5 x6 x7.(n_river(x7) & n_air(x5) & by(e1,x7) & on(e1,x6) & n_sidewalk(x6) & in(e1,x5) & Actor(e1,x1) & v_jump(e1) & rel(x1,x2) & n_boy(x4) & card_eq_1(x4) & n_girl(x3) & card_eq_3(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_teenager(x1) & card_eq_4(x1))
exists e1 x1 x2 x3.(n_river(x3) & a_topic(x1) & by(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_teenager(x1) & card_eq_4(x1))