premise: A man jumps onto a skateboard that is sitting on a folding chair.
hypothesis: There is a skateboard on a folding chair.
explanation_1: A skateboard sitting on a folding chair must be on a folding chair.
explanation_2: "sitting on a folding chair." just became on a folding chair since chairs are made for sitting and doesn't need to be specified. I am not sure why the man was omitted entirely
explanation_3: The man jumps on a skateboard.
premise_logic: exists e1 e2 s1 x1 x2 x3 x4.(onto(e1,x2) & on(e2,x4) & n_chair(x4) & a_folding(s1) & Theme(s1,x4) & Actor(e2,x3) & v_sit(e2) & (x2 = x3) & n_skateboard(x2) & Actor(e1,x1) & v_jump(e1) & n_man(x1))
hypothesis_logic: exists p1 x1 s1 x2 x3.((x1 = x2) & on(x2,x3) & n_chair(x3) & a_folding(s1) & Theme(s1,x3) & n_skateboard(x2))