premise: Man biking in half pipe with graffiti on cement.
hypothesis: Man skateboarding by himself on a half-wall with graffiti on cement.
explanation_1: The man cannot be biking and skateboarding at the same time.
explanation_2: Biking is not the same as skateboarding.
explanation_3: A man cannot be both biking and skateboarding at the same time.
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.(a_topic(x1) & on(x1,x3) & with(x3,x4) & on(x4,x5) & n_cement(x5) & n_graffitus(x4) & n_half-wall(x3) & by(x1,x2) & n_male(x2) & n_skateboarding(x1) & of(x1,x2) & n_man(x2))