premise: 3 girls chatting and laughing on the stairwell.
hypothesis: Girls are not having a good time.
explanation_1: Not having a good time versus laughing.
explanation_2: If their laughing they are having a good time.
explanation_3: If people are not having a good time, they are unlikely to be chatting and laughing.
premise_logic: exists e1 e2 x1 x2 x3.(n_stairwell(x3) & on(e2,x3) & Actor(e2,x2) & v_laugh(e2) & n_girl(x2) & n_date(x2) & a_date_day_03(x2) & a_date_day_03(x2) & Actor(e1,x1) & v_chat(e1) & n_girl(x1) & n_date(x1) & a_date_day_03(x1) & a_date_day_03(x1))
hypothesis_logic: exists x1.(-exists e1 s1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_time(x2) & a_good(s1) & Theme(s1,x2)) & n_girl(x1))
premise_sim: exists e1 e2 x1 x2 x3.(v_laugh(e2) & v_chat(e1) & on(e2,x3) & n_stairwell(x3) & n_girl(x2) & n_girl(x1) & n_date(x2) & n_date(x1) & a_date_day_03(x2) & a_date_day_03(x1) & Actor(e2,x2) & Actor(e1,x1))
hypothesis_sim: exists x1.(n_girl(x1) & all e1 s1 x2.(-v_have(e1) | -n_time(x2) | -a_good(s1) | -Theme(s1,x2) | -Theme(e1,x2) | -Actor(e1,x1)))