The stop sign is folded up against the side of the bus.
The stop sign is folded up on the side of the bus towards the back.
The stop sign is on the side of the bus, but it could be towards the back or the front.
exists e1 s1 x1 x2 x3 x4.(n_bus(x4) & n_side(x3) & n_sign(x1) & of(x1,x2) & n_stop(x2) & a_up(s1) & Manner(e1,s1) & against(e1,x3) & of(x3,x4) & Theme(e1,x1) & v_fold(e1))
exists e1 s1 x1 x2 x3 x4 x5.(n_back(x5) & n_bus(x4) & n_side(x3) & n_sign(x1) & of(x1,x2) & n_stop(x2) & on(e1,x3) & of(x3,x4) & towards(x4,x5) & a_up(s1) & Manner(e1,s1) & Theme(e1,x1) & v_fold(e1))