Two children are climbing stairs which lead to an airplane.
Two children embark an aircraft.
The children that are climbing stairs to an airplane are embarking an aircraft.
exists e2 e1 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 x2.(Theme(e1,x2) & Actor(e1,x1) & v_embark(e1) & n_aircraft(x2) & n_child(x1) & card_eq_2(x1))