premise: A surfer on a roiling wave.
hypothesis: A child swimming
explanation_1: Surfers ride on the water surface while swimming takes place under the water surface.
premise_logic: exists e1 x1 x2.(a_topic(x1) & on(x1,x2) & n_wave(x2) & Actor(e1,x2) & v_roil(e1) & n_surfer(x1))
hypothesis_logic: exists x1 x2.(a_topic(x1) & n_swimming(x1) & of(x1,x2) & n_child(x2))
premise_sim: exists e1 x1 x2.(v_roil(e1) & on(x1,x2) & n_wave(x2) & n_surfer(x1) & a_topic(x1) & Actor(e1,x2))
hypothesis_sim: exists x1 x2.(of(x1,x2) & n_swimming(x1) & n_child(x2) & a_topic(x1))