A helicopter and a small plane are in the air.
Two planes are flying.
Two planes cannot be flying because there is only a helicopter and one plane in the air.
exists p1 s1 x1 x2 x3 x4.(n_air(x4) & in(x1,x4) & subset_of(x3,x1) & n_plane(x3) & a_small(s1) & Theme(s1,x3) & subset_of(x2,x1) & n_helicopter(x2))
exists e1 x1.(Actor(e1,x1) & v_fly(e1) & n_plane(x1) & card_eq_2(x1))