premise: Person doing a trick on a skateboard in a skate park while people watch.
hypothesis: There is a person on a skateboard.
explanation_1: A person doing a trick on a skateboard must be on a skateboard.
explanation_2: Doing a trick on a skateboard is the same as being on a skateboard.
explanation_3: Person doing a trick on a skateboard means there is a person on a skateboard.
premise_logic: exists e1 p1 x1 x2 x3 x4 x5.(ne_nam_person(x1) & exists e2 x6.(Actor(e2,x6) & v_watch(e2) & n_people(x6)) & while(e1,p1) & in(e1,x4) & n_park(x4) & of(x4,x5) & n_skate(x5) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_skateboard(x3) & n_trick(x2))
hypothesis_logic: exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_skateboard(x3) & n_person(x2))