premise: A young man does tricks on his skateboard.
hypothesis: A guy rolls forward.
explanation_1: Doing tricks on a skateboard does not imply that he rolls forward.
explanation_2: There are tricks other than rolls forward that can be done on skateboard.
explanation_3: Tricks can be done on a skateboard without rolling forward.
premise_logic: exists e1 s1 x1 x2 x3.(on(e1,x3) & n_skateboard(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
hypothesis_logic: exists e1 s1 x1.(a_forward(s1) & Manner(e1,s1) & Actor(e1,x1) & v_roll(e1) & n_guy(x1))
premise_sim: exists e1 s1 x1 x2 x3.(v_do(e1) & on(e1,x3) & of(x3,x1) & n_trick(x2) & n_skateboard(x3) & n_man(x1) & n_male(x1) & a_young(s1) & Theme(s1,x1) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists e1 s1 x1.(v_roll(e1) & n_guy(x1) & a_forward(s1) & Manner(e1,s1) & Actor(e1,x1))