premise: Very large group of old people riding in boats down a river.
hypothesis: A geriatric group of student canoeists follow their instructor.
explanation_1: Riding in boats does not necessarily student canoeists and an instructor since rafting, sailing, and other forms of boating exist and the group may have not needed an instructor
explanation_2: Floating down a river in a boat does not mean you are a student.
explanation_3: You can boat on a river without a instructor. Also you do not have to be canoeists.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x3) & down(e1,x6) & n_river(x6) & in(e1,x5) & n_boat(x5) & Actor(e1,x4) & v_ride(e1) & (x3 = x4) & n_people(x3) & a_old(s2) & Theme(s2,x3) & n_group(x1) & a_large(s1) & Theme(s1,x1) & (x1 = x2) & ne_nam_very(x2))
hypothesis_logic: exists e1 s1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_follow(e1) & n_instructor(x4) & of(x4,x1) & n_thing(x1) & of(x1,x2) & n_canoeist(x2) & of(x2,x3) & n_student(x3) & n_group(x1) & a_geriatric(s1) & Theme(s1,x1))
premise_sim: exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(v_ride(e1) & of(x1,x3) & ne_nam_very(x2) & n_river(x6) & n_people(x3) & n_group(x1) & n_boat(x5) & in(e1,x5) & down(e1,x6) & a_topic(x1) & a_old(s2) & a_large(s1) & Theme(s2,x3) & Theme(s1,x1) & Actor(e1,x4) & (x3 = x4) & (x1 = x2))
hypothesis_sim: exists e1 s1 x1 x2 x3 x4.(v_follow(e1) & of(x4,x1) & of(x2,x3) & of(x1,x2) & n_thing(x1) & n_student(x3) & n_instructor(x4) & n_group(x1) & n_canoeist(x2) & a_geriatric(s1) & Theme(s1,x1) & Theme(e1,x4) & Actor(e1,x1))