Two girls are enjoying themselves on a spinning platform.
Two girls are sitting by the spinning platform.
By is very different from on.
exists e1 x1 x2 x3 x4.(n_group(x2) & on(e1,x3) & n_platform(x3) & of(x3,x4) & n_spinning(x4) & Theme(e1,x2) & Actor(e1,x1) & v_enjoy(e1) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_platform(x2) & of(x2,x3) & n_spinning(x3) & by(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & card_eq_2(x1))