A person in hiking gear is standing on a hill with a mountain in the background.
A man is sitting on an active volcano.
One cannot be sitting and standing at the same time.
exists e1 x1 x2 x3 x4 x5 x6.(n_background(x6) & with(e1,x5) & in(x5,x6) & n_mountain(x5) & on(e1,x4) & n_hill(x4) & Actor(e1,x1) & v_stand(e1) & in(x1,x2) & n_gear(x2) & of(x2,x3) & n_hiking(x3) & n_person(x1))
exists e1 s1 x1 x2.(on(e1,x2) & n_volcano(x2) & a_active(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))