premise: A snowboarder is grinding down a long concrete rail.
hypothesis: A snowboarder is practicing a new trick.
explanation_1: Grinding down a rail doesn't necessarily imply practicing a new trick.
explanation_2: Grinding a rail is not necessarily practicing.
explanation_3: Grinding down a concrete rail does not imply that they are practicing a new trick.
premise_logic: exists e1 s1 s2 x1 x2 x3.(a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_grind(e1) & n_rail(x2) & of(x2,x3) & n_concrete(x3) & a_long(s1) & Theme(s1,x2) & n_snowboarder(x1))
hypothesis_logic: exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_trick(x2) & a_new(s1) & Theme(s1,x2) & n_snowboarder(x1))
premise_sim: exists e1 s1 s2 x1 x2 x3.(v_grind(e1) & of(x2,x3) & n_snowboarder(x1) & n_rail(x2) & n_concrete(x3) & a_long(s1) & a_down(s2) & Theme(s1,x2) & Theme(e1,x2) & Manner(e1,s2) & Actor(e1,x1))
hypothesis_sim: exists e1 s1 x1 x2.(v_practice(e1) & n_trick(x2) & n_snowboarder(x1) & a_new(s1) & Theme(s1,x2) & Theme(e1,x2) & Actor(e1,x1))