premise: a skateboarder grinds a rail.
hypothesis: A skateboarder is at a competition.
explanation_1: A skateboarder who grinds a rail is not necessarily at a competition.
premise_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_grind(e1) & n_rail(x2) & n_skateboarder(x1))
hypothesis_logic: exists p1 x1.(exists x2.(at(x1,x2) & n_competition(x2)) & n_skateboarder(x1))
premise_sim: exists e1 x1 x2.(v_grind(e1) & n_skateboarder(x1) & n_rail(x2) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists x1.(n_skateboarder(x1) & exists x2.(n_competition(x2) & at(x1,x2)))