premise: Water polo swimmers competing for a loose ball.
hypothesis: A group of water polo swimmers having a water polo match.
explanation_1: Competing implies that the water polo swimmers are having a water polo match.
explanation_2: If there are swimmers playing water polo there is a group of swimmers.
explanation_3: Water polo swimmers can only be going after a loose ball at a match.
premise_logic: exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & for(e1,x5) & n_ball(x5) & a_loose(s1) & Theme(s1,x5) & Actor(e1,x4) & v_compete(e1) & (x1 = x4) & n_swimmer(x1) & (x1 = x3) & ne_nam_polo(x3) & (x1 = x2) & ne_nam_water(x2))
hypothesis_logic: exists e1 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(x1) & Theme(e1,x6) & Actor(e1,x5) & v_have(e1) & n_match(x6) & of(x6,x8) & n_polo(x8) & of(x6,x7) & n_water(x7) & (x1 = x5) & of(x1,x2) & n_swimmer(x2) & of(x2,x4) & n_polo(x4) & of(x2,x3) & n_water(x3) & n_group(x1))