Men in orange doing clean up beside of a subway.
Men are littering in the subway station.
If you are doing clean up you are not littering.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & of(e1,x5) & n_subway(x5) & r_beside(e1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & n_clean(x4) & (x1 = x3) & in(x1,x2) & n_orange(x2) & n_man(x1))
exists e1 x1 x2 x3.(n_station(x2) & of(x2,x3) & n_subway(x3) & in(e1,x2) & Actor(e1,x1) & v_litter(e1) & n_man(x1))