Guys are running in a marathon.
All the guys had both their legs amputated.
Guys that have both legs amputated cannot be running in a marathon.
exists e1 x1 x2.(in(e1,x2) & n_marathon(x2) & Actor(e1,x1) & v_run(e1) & n_guy(x1))
exists x2 x3.(n_leg(x3) & of(x3,x2) & n_thing(x2) & n_guy(x2) & all x1.((x1 = x2) -> exists e1 e2 x4 x5.(Theme(e2,x3) & Actor(e2,x1) & v_have(e2) & Time(x3,x5) & n_both(x5) & Theme(e1,x4) & v_amputate(e1) & (x3 = x4))))