premise: a boy smiles underwater.
hypothesis: The boy is a swimmer.
explanation_1: underwater   doesn't always mean swimmer.
premise_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_smile(e1) & n_underwater(x2) & n_boy(x1))
hypothesis_logic: exists p1 x1.(n_boy(x1) & exists x2.((x1 = x2) & n_swimmer(x2)))
premise_sim: exists e1 x1 x2.(v_smile(e1) & n_underwater(x2) & n_boy(x1) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists x1.(n_boy(x1) & exists x2.(n_swimmer(x2) & (x1 = x2)))