premise: A family day at the beach.
hypothesis: There are only families at the beach today.
explanation_1: There are only families today, so one could call today a "family day".
explanation_2: If there are only families at the beach, it would be a family day.
explanation_3: If it's family day at the beach, then there are families at the beach.
premise_logic: exists x1 x2 x3.(n_beach(x3) & a_topic(x1) & at(x1,x3) & n_day(x1) & of(x1,x2) & n_family(x2))
hypothesis_logic: exists p1 s1 x1 x2 x3.(n_beach(x2) & Time(p1,x3) & n_today(x3) & at(p1,x2) & a_only(s1) & Manner(p1,s1) & exists x4.((x1 = x4) & n_family(x4)))