A girl is sitting on the side of a mountain.
A female is sitting on a mountain.
A girl is a  female.
exists e1 x1 x2 x3.(n_side(x2) & on(e1,x2) & of(x2,x3) & n_mountain(x3) & Actor(e1,x1) & v_sit(e1) & n_girl(x1))
exists e1 x1 x2.(on(e1,x2) & n_mountain(x2) & Actor(e1,x1) & v_sit(e1) & n_female(x1))