A woman in purple is sampling some food from a table.
Nobody is sampling
There cannot be someone sampling and nobody sampling.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_sample(e1) & from(x3,x4) & n_table(x4) & n_food(x3) & in(x1,x2) & n_purple(x2) & n_woman(x1))
-exists e1 x1.(Actor(e1,x1) & v_sample(e1) & n_person(x1))