A mountain landscape.
There is a large flat desert.
A mountain landscape cannot be a flat desert.
exists x1 x2.(a_topic(x1) & n_landscape(x1) & of(x1,x2) & n_mountain(x2))
exists p1 x1 s1 s2 x2.((x1 = x2) & n_desert(x2) & a_flat(s2) & Theme(s2,x2) & a_large(s1) & Theme(s1,x2))