Three people stand at the top of an outdoor staircase.
Three people are racing airplanes.
People can not race airplanes while standing at the top of a staircase.
exists e1 s1 x1 x2 x3.(n_top(x2) & at(e1,x2) & of(x2,x3) & n_staircase(x3) & a_outdoor(s1) & Theme(s1,x3) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_race(e1) & n_airplane(x2) & n_people(x1) & card_eq_3(x1))