premise: A snowboarder is grinding on a rail in a snowy, mountainous area.
hypothesis: The snowboarder is outside.
explanation_1: It is safe to say that a snowboarder would only be grinding on a rail outside since snow is required.
explanation_2: A snowy, mountainous area is outside.
explanation_3: If one is on a snowy, mountainous area, one must be outside.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4.(on(e1,x2) & in(x2,x3) & n_area(x3) & a_mountainous(s2) & Theme(s2,x3) & a_,(s1) & Theme(s1,x3) & of(x3,x4) & n_snowy(x4) & n_rail(x2) & Actor(e1,x1) & v_grind(e1) & n_snowboarder(x1))
hypothesis_logic: exists s1 x1.(n_snowboarder(x1) & Theme(s1,x1) & a_outside(s1))