Three people skydiving, one is making a funny face.
Nobody is skydiving.
Either three people are skydiving or nobody is skydiving. It cannot be both.
exists e2 e1 s1 x1 x2 x3 x4.(rel(e1,x3) & Actor(e2,x4) & v_skydive(e2) & (x3 = x4) & n_people(x3) & card_eq_3(x3) & Theme(e1,x2) & Actor(e1,x1) & v_make(e1) & n_face(x2) & a_funny(s1) & Theme(s1,x2) & n_thing(x1) & card_eq_1(x1))
-exists e1 x1.(Actor(e1,x1) & v_skydive(e1) & n_person(x1))