Two girls are in a sack race.
Two boys are sack racing.
Girls are not the same as boys.
exists p1 x1.(exists x2 x3.(in(x1,x2) & n_race(x2) & of(x2,x3) & n_sack(x3)) & n_girl(x1) & card_eq_2(x1))
exists p1 x1.(exists s1 x2.((x1 = x2) & n_racing(x2) & a_sack(s1) & Theme(s1,x2)) & n_boy(x1) & card_eq_2(x1))