The back of a stop sign is visible in front of the stone building.
The yield sign is in the back of the building.
One says stop sign and other says yield sign.
exists s1 x1 x2 x3 x4 x5 x6.(n_building(x5) & of(x5,x6) & n_stone(x6) & n_back(x1) & in(s1,x4) & of(x4,x5) & n_front(x4) & Theme(s1,x1) & a_visible(s1) & of(x1,x2) & n_sign(x2) & of(x2,x3) & n_stop(x3))
exists p1 x1 x2 x3 x4.(n_building(x4) & n_back(x3) & n_sign(x1) & of(x1,x2) & n_yield(x2) & in(x1,x3) & of(x3,x4))