Someone is selling food on a set of doorsteps.
The woman sold cookies on the doorstep.
Someone is selling food on a set of doorsteps does not imply the seller is a woman who sold cookies on the doorstep.
exists e1 x1 x2 x3 x4.(on(e1,x3) & of(x3,x4) & n_doorstep(x4) & n_set(x3) & Theme(e1,x2) & Actor(e1,x1) & v_sell(e1) & n_food(x2) & n_person(x1))
exists e1 x1 x2 x3.(n_doorstep(x3) & n_woman(x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_sell(e1) & n_cookie(x2))