premise: A surfer on a wave.
hypothesis: A surfer catching a swell.
explanation_1: A swell is a series of waves; 'catching' is a surfing term for taking advantage of waves; if a surfer is on a wave then it's reasonable to assume that wave is one of a series.
explanation_2: A wave and a swell are the same thing.
explanation_3: Catching a swell is surfer lingo for catching a wave.
premise_logic: exists x1 x2.(a_topic(x1) & on(x1,x2) & n_wave(x2) & n_surfer(x1))
hypothesis_logic: exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_catch(e1) & n_swell(x3) & (x1 = x2) & n_surfer(x1))
premise_sim: exists x1 x2.(on(x1,x2) & n_wave(x2) & n_surfer(x1) & a_topic(x1))
hypothesis_sim: exists e1 x1 x2 x3.(v_catch(e1) & n_swell(x3) & n_surfer(x1) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & (x1 = x2))