A bassist and a guitarist are performing at a concert.
The guitarist is standing on a mountain.
The guitarist cannot stand on a mountain and also be performing at a concert.
exists e1 x1 x2 x3 x4.(at(e1,x4) & n_concert(x4) & Actor(e1,x1) & v_perform(e1) & subset_of(x3,x1) & n_guitarist(x3) & subset_of(x2,x1) & n_bassist(x2))
exists e1 x1 x2.(n_guitarist(x1) & on(e1,x2) & n_mountain(x2) & Actor(e1,x1) & v_stand(e1))