Two children are climbing stairs which lead to an airplane.
Two children are playing
they can either be playing or climbing stairs which lead to a airplane
exists e1 e2 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_climb(e2) & to(e1,x4) & n_airplane(x4) & Actor(e1,x3) & v_lead(e1) & (x2 = x3) & n_stair(x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_2(x1))