premise: Expert snowboard is trying a new trick.
hypothesis: The person is surfing on the water.
explanation_1: The person may either be surfing or snowboarding.
explanation_2: One can not snowboard and surf on the water simultaneously.
explanation_3: person can't be surfing if on snowboard
premise_logic: exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_try(e1) & n_trick(x3) & a_new(s1) & Theme(s1,x3) & n_snowboard(x1) & (x1 = x2) & ne_nam_expert(x2))
hypothesis_logic: exists e1 x1 x2.(n_water(x2) & n_person(x1) & on(e1,x2) & Actor(e1,x1) & v_surf(e1))