Many people are outside of a large building.
A large group of people in the middle of a desert surrounded by nothing but sand.
The people cannot be both by a large building and surrounded  by nothing but sand.
exists e1 s1 x1 x2.(of(e1,x2) & n_building(x2) & a_large(s1) & Theme(s1,x2) & r_outside(e1) & Actor(e1,x1) & v_be(e1) & n_people(x1) & n_quantity(x1))
exists e1 s1 x1 x2 x3 x4 x5.(n_middle(x3) & a_topic(x1) & of(x1,x2) & -exists x6 x7.(Actor(e1,x6) & but(x6,x7) & n_sand(x7) & n_thing(x6)) & Theme(e1,x5) & v_surround(e1) & (x2 = x5) & in(x2,x3) & of(x3,x4) & n_desert(x4) & n_people(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))