These men operate the cement mixer.
Men walking away from cement mixer.
One cannot operate the cement mixer while walking away.
exists e1 x1 x2 x3.(n_mixer(x2) & of(x2,x3) & n_cement(x3) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_operate(e1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & from(e1,x3) & n_mixer(x3) & of(x3,x4) & n_cement(x4) & r_away(e1) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_man(x1))