Some people wander past a wall covered in graffiti.
The people are outside
Graffiti covered walls can be found inside or outside.
exists e1 e2 x1 x2 x3 x4.(past(e1,x2) & in(e2,x4) & n_graffitus(x4) & Theme(e2,x3) & v_cover(e2) & (x2 = x3) & n_wall(x2) & Actor(e1,x1) & v_wander(e1) & n_people(x1))
exists s1 x1.(n_people(x1) & Theme(s1,x1) & a_outside(s1))