premise: A surfer riding a big wave.
hypothesis: There are no waves
explanation_1: If there are no waves, the surfer cannot be riding a big wave.
premise_logic: exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_wave(x3) & a_big(s1) & Theme(s1,x3) & (x1 = x2) & n_surfer(x1))
hypothesis_logic: exists p1 x1.-exists x2.((x1 = x2) & n_wave(x2))
premise_sim: exists e1 s1 x1 x2 x3.(v_ride(e1) & n_wave(x3) & n_surfer(x1) & a_topic(x1) & a_big(s1) & Theme(s1,x3) & Theme(e1,x3) & Actor(e1,x2) & (x1 = x2))
hypothesis_sim: exists x1.all x2.(-n_wave(x2) | -(x1 = x2))