A soldier on the stairs sitting crossed-legged on a chair with a rifle hanging from the armrest.
A man sitting on the stairs.
You can not infer she is on the stairs.
exists e1 p1 s1 x1 x2 x3 x4 x5 x6.(n_armrest(x6) & n_stair(x2) & a_topic(x1) & on(x1,x2) & from(e1,x6) & with(e1,x5) & n_hanging(x5) & a_rifle(s1) & Theme(s1,x5) & on(e1,x4) & n_chair(x4) & exists s2.(Theme(s2,x3) & a_crossed-legged(s2)) & Topic(e1,p1) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_soldier(x1))
exists e1 x1 x2 x3.(n_stair(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))