premise: Man biking in half pipe with graffiti on cement.
hypothesis: Man biking with his friends in half pipe with graffiti on cement.
explanation_1: Biking in a half pipe does imply you are with friends.
explanation_2: We have no idea if he is with his friends, he could be by himself.
explanation_3: A man can be biking by himself, not necessarily with his friends.
premise_logic: exists x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x3) & on(x3,x6) & n_cement(x6) & with(x3,x5) & n_graffitus(x5) & n_pipe(x3) & of(x3,x4) & n_half(x4) & n_biking(x1) & of(x1,x2) & n_man(x2))
hypothesis_logic: exists x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & with(x1,x3) & in(x3,x4) & on(x4,x7) & n_cement(x7) & with(x4,x6) & n_graffitus(x6) & n_pipe(x4) & of(x4,x5) & n_half(x5) & n_friend(x3) & of(x3,x1) & n_male(x1) & n_biking(x1) & of(x1,x2) & n_man(x2))