premise: A boy plays in the surf.
hypothesis: A boy is playing on the beach.
explanation_1: In the surf implies on the beach.
explanation_2: Surf implies beach, and plays is a paraphrase of is playing.
explanation_3: to be playing in the surf implies you are at the beach
premise_logic: exists e1 x1 x2.(n_surf(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))
hypothesis_logic: exists e1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))