Two construction workers are standing behind a fence with an orange moped in the fore-ground.
There is no moped.
If there is an orange moped, than saying there is no moped is untrue.
exists e1 e2 x1 x2 x3 x4 x5 x6.(n_fore-ground(x6) & with(e1,x4) & in(e2,x6) & Theme(e2,x5) & v_mope(e2) & (x4 = x5) & n_orange(x4) & behind(e1,x3) & n_fence(x3) & Actor(e1,x1) & v_stand(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))
exists p1 x1.-exists x2.((x1 = x2) & n_moped(x2))