The stop sign is folded up against the side of the bus.
The bus has a stop sign on one side.
Folded up against the side can be reworded as one side.
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 x1 x2 x3 x4.(n_bus(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & on(x2,x4) & n_side(x4) & card_eq_1(x4) & n_sign(x2) & of(x2,x3) & n_stop(x3))