premise: A group of people wearing light blue shirts and dark blue pants moving around all together.
hypothesis: A flash mob performs an impromptu dance.
explanation_1: Not all groups of people are flash mobs.
explanation_2: A group people in similar costume and moving together make flash mob for dance.
explanation_3: Just because a group of people wearing light blue shirts and dark blue pants moving around all together, doesn't mean a flash mob performs an impromptu dance.
premise_logic: exists e1 e2 s1 s2 s3 s4 x1 x2 x3 x4.(all x5.(n_thing(x5) -> exists s5.(a_together(s5) & Manner(e2,s5) & around(e2,x5))) & Actor(e2,x4) & v_move(e2) & n_pants(x4) & a_blue(s4) & Theme(s4,x4) & a_dark(s3) & Theme(s3,x4) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_shirt(x3) & a_blue(s2) & Theme(s2,x3) & a_light(s1) & Theme(s1,x3) & of(x1,x2) & n_people(x2) & n_group(x1))
hypothesis_logic: exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_dance(x3) & a_impromptu(s1) & Theme(s1,x3) & n_mob(x1) & of(x1,x2) & n_flash(x2))