A woman is sitting in front of a machine.
The woman is standing.
A woman cannot be sitting and standing simultaneously.
exists e1 x1 x2 x3.(in(e1,x2) & of(x2,x3) & n_machine(x3) & n_front(x2) & Actor(e1,x1) & v_sit(e1) & n_woman(x1))
exists e1 x1.(n_woman(x1) & Actor(e1,x1) & v_stand(e1))