A creek runs through the grassy area.
the creek does not run through the grassy area.
A creek either runs or it does not run, it cannot do both simultaneously.
exists e1 s1 x1 x2.(n_area(x2) & a_grassy(s1) & Theme(s1,x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_creek(x1))
exists s1 x1 x2.(n_area(x2) & a_grassy(s1) & Theme(s1,x2) & n_creek(x1) & -exists e1.(through(e1,x2) & Actor(e1,x1) & v_run(e1)))