Young people in yellow shirts prepare colorful food.
The people are not wearing shirts.
People who are not wearing shirts cannot be in yellow shirts.
exists e1 s1 s2 s3 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_prepare(e1) & n_food(x3) & a_colorful(s3) & Theme(s3,x3) & in(x1,x2) & n_shirt(x2) & a_yellow(s2) & Theme(s2,x2) & n_people(x1) & a_young(s1) & Theme(s1,x1))
exists x1.(n_people(x1) & -exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_shirt(x2)))