Two people waving their hands in the air and looking up.
Two people are waving to a helicopter.
The two people could be looking up to an airplane and not a helicopter.
exists e1 e2 s1 x1 x2 x3 x4.(n_air(x3) & a_up(s1) & Manner(e2,s1) & Actor(e2,x4) & v_look(e2) & n_people(x4) & card_eq_2(x4) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_wave(e1) & n_hand(x2) & of(x2,x1) & n_thing(x1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(to(e1,x2) & n_helicopter(x2) & Actor(e1,x1) & v_wave(e1) & n_people(x1) & card_eq_2(x1))