One boy in a purple sweater is hugging another boy in a purple sweater.
Two boys are hugging because they're wearing matching sweaters.
Just because one boy in a purple sweater is hugging another boy in a purple sweater does not mean they are hugging because they are wearing matching sweaters.
exists e1 s1 s2 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_hug(e1) & in(x3,x4) & n_sweater(x4) & a_purple(s2) & Theme(s2,x4) & n_boy(x3) & -(x3 = x1) & n_boy(x1) & n_boy(x1) & in(x1,x2) & n_sweater(x2) & a_purple(s1) & Theme(s1,x2) & card_eq_1(x1))
exists e1 p1 x1.(exists e2 e3 x2.(Theme(e3,x2) & Actor(e3,x1) & v_wear(e3) & n_sweater(x2) & Actor(e2,x2) & v_match(e2)) & n_thing(x1) & because(e1,p1) & Actor(e1,x1) & v_hug(e1) & n_boy(x1) & card_eq_2(x1))