premise: A man in a colorful shirt and a lady in a white blouse sign copies of books for people.
hypothesis: Two people sign copies of books.
explanation_1: The word, two people, is a replacement for a man and a lady.
explanation_2: A man and a lady equals two people.
explanation_3: Man and a lady are two people.
premise_logic: exists s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(s1) & subset_of(x3,s1) & for(x3,x8) & n_people(x8) & in(x3,x4) & of(x4,x7) & n_book(x7) & n_copy(x4) & of(x4,x6) & n_sign(x6) & of(x4,x5) & n_blouse(x5) & a_white(s3) & Theme(s3,x4) & n_lady(x3) & subset_of(x1,s1) & in(x1,x2) & n_shirt(x2) & a_colorful(s2) & Theme(s2,x2) & n_man(x1))
hypothesis_logic: exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_sign(e1) & of(x2,x3) & n_book(x3) & n_copy(x2) & n_people(x1) & card_eq_2(x1))