premise: A snowboarder is grinding down a long concrete rail.
hypothesis: The snowboarder is grinding a rail.
explanation_1: A snowboarder grinding down a long concrete rail must be grinding a rail.
explanation_2: For the snowboarder to be grinding down a long concreate rail, they must be grinding a rail.
explanation_3: RAIL CAN BE LONG AND CONCRETE AND CAN BE GRINDED
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 x1 x2.(n_snowboarder(x1) & Theme(e1,x2) & Actor(e1,x1) & v_grind(e1) & n_rail(x2))
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 x1 x2.(v_grind(e1) & n_snowboarder(x1) & n_rail(x2) & Theme(e1,x2) & Actor(e1,x1))