premise: Skateboarder grinds a concrete railing.
hypothesis: The skateboard is black
explanation_1: No way to know the color the skateboarder's skateboard is black. It could be red or even purple.
premise_logic: exists e1 s1 x1 x2.(ne_nam_skateboarder(x1) & Theme(e1,x2) & Actor(e1,x1) & v_grind(e1) & n_railing(x2) & a_concrete(s1) & Theme(s1,x2))
hypothesis_logic: exists s1 x1.(n_skateboard(x1) & Theme(s1,x1) & a_black(s1))
premise_sim: exists e1 s1 x1 x2.(v_grind(e1) & ne_nam_skateboarder(x1) & n_railing(x2) & a_concrete(s1) & Theme(s1,x2) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists s1 x1.(n_skateboard(x1) & a_black(s1) & Theme(s1,x1))