premise: Group yoga class exercising.
hypothesis: A group of people holding various positions for a period of time.
explanation_1: Yoga does not only involve holding various positions.
explanation_2: Just because a group of people holding various position doesn't mean they are in a group yoga class.
explanation_3: Just because there is a group yoga class exercising does not mean that they are holding various positions for a period of time.
premise_logic: exists e1 x1 x2 x3.(Actor(e1,x1) & v_exercise(e1) & n_class(x1) & (x1 = x3) & ne_nam_yoga(x3) & (x1 = x2) & ne_org_group(x2))
hypothesis_logic: exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_hold(e1) & for(x4,x5) & of(x5,x6) & n_time(x6) & n_period(x5) & n_position(x4) & a_various(s1) & Theme(s1,x4) & (x2 = x3) & n_people(x2) & n_group(x1))