There is one man who is sitting on top of a school bus while another man walks down the aisle of the bus.
The school bus is yellow.
The school bus can of any other color besides yellow.
exists p1 x1 x8.(n_aisle(x8) & exists e1 p2 x2 x3 x4 x5 x6.((x1 = x2) & exists e2 s1 x7.(a_down(s1) & Manner(e2,s1) & Theme(e2,x8) & Actor(e2,x7) & v_walk(e2) & of(x8,x5) & n_man(x7) & -(x7 = x2)) & n_bus(x5) & n_bus(x5) & n_man(x2) & n_man(x2) & while(e1,p2) & on(e1,x4) & of(x4,x5) & of(x5,x6) & n_school(x6) & n_top(x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & card_eq_1(x2)))
exists s1 x1 x2.(n_bus(x1) & of(x1,x2) & n_school(x2) & Theme(s1,x1) & a_yellow(s1))