Four people are on a ski slope.
People are outside.
People on a ski slope implies the people are outside.
exists p1 x1.(exists x2 x3.(on(x1,x2) & n_slope(x2) & of(x2,x3) & n_ski(x3)) & n_people(x1) & card_eq_4(x1))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_people(x1))