premise: A skier goes down a hill with a mountain as a backdrop.
hypothesis: A surfer riding a wave.
explanation_1: A skier cannot be a surfer simultaneously
explanation_2: A skier cant be surfer at same time.
explanation_3: A surfer cannot be a skier at the same time.
premise_logic: exists e1 x1 x2 x3 x4.(with(e1,x3) & as(x3,x4) & n_backdrop(x4) & n_mountain(x3) & down(e1,x2) & n_hill(x2) & Actor(e1,x1) & v_go(e1) & n_skier(x1))
hypothesis_logic: exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_wave(x3) & (x1 = x2) & n_surfer(x1))