premise: A man and a young girl swimming.
hypothesis: a mother and son eating lunch
explanation_1: It cannot be a man and young girl swimming and a mother and son eating lunch simultaneously.
explanation_2: A mother is not a man.  A son is not a young girl.  Eating lunch is not swimming.
explanation_3: One can't be eating and swim simultaneously.
premise_logic: exists s1 s2 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & n_swimming(x2) & of(x2,x3) & n_girl(x3) & a_young(s2) & Theme(s2,x2) & subset_of(x1,s1) & n_man(x1))
hypothesis_logic: exists x1 x2 x3 x4.(a_topic(x1) & n_eating(x1) & Time(x1,x4) & n_lunch(x4) & subset_of(x3,x1) & n_son(x3) & subset_of(x2,x1) & n_mother(x2))
premise_sim: exists s1 s2 x1 x2 x3.(subset_of(x2,s1) & subset_of(x1,s1) & of(x2,x3) & n_swimming(x2) & n_man(x1) & n_girl(x3) & a_young(s2) & a_topic(s1) & Theme(s2,x2))
hypothesis_sim: exists x1 x2 x3 x4.(subset_of(x3,x1) & subset_of(x2,x1) & n_son(x3) & n_mother(x2) & n_lunch(x4) & n_eating(x1) & a_topic(x1) & Time(x1,x4))