premise: A group of 9 men and women walking upstairs.
hypothesis: The group is working together.
explanation_1: A group of people walking together may not be working together.
explanation_2: Not all those walking upstairs at one time are actually working together.
explanation_3: Nine people may walk up stairs without being a group that is working together.
premise_logic: exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x2) & Theme(e1,x6) & Actor(e1,x5) & v_walk(e1) & n_upstairs(x6) & (x2 = x5) & n_woman(x4) & n_man(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_date(x2) & a_date_day_09(x2) & a_date_day_09(x2) & n_group(x1))
hypothesis_logic: exists e1 s1 x1.(n_group(x1) & a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1))