premise: These girls are having a great time looking for seashells.
hypothesis: The girls are happy.
explanation_1: the girls are having great time looking for seashells so they are happy.
explanation_2: When someone is having a great time they're happy.
explanation_3: Having a great time generally implies that your are in a happy mood.
premise_logic: exists e2 e1 s1 x1 x2 x3 x4.(n_girl(x1) & Theme(e2,x2) & Actor(e2,x1) & v_have(e2) & for(e1,x4) & n_seashell(x4) & Actor(e1,x3) & v_look(e1) & (x2 = x3) & n_time(x2) & a_great(s1) & Theme(s1,x2))
hypothesis_logic: exists s1 x1.(n_girl(x1) & Theme(s1,x1) & a_happy(s1))