premise: Group of casually dressed people, walking towards a large sea vessel.
hypothesis: They are going on a submarine voyage.
explanation_1: Not all sea vessels are submarines. Not all people walking towards a sea vessel are going on a submarine voyage.
explanation_2: Vessel are not always submarines, and they may not be on a voyage
explanation_3: They group may have been walking towards a ship and not going on a submarine voyage.
premise_logic: exists e2 e1 s1 x1 x2 x3 x4.(ne_org_group(x1) & towards(e2,x3) & n_vessel(x3) & of(x3,x4) & n_sea(x4) & a_large(s1) & Theme(s1,x3) & Actor(e2,x1) & v_walk(e2) & of(x1,x2) & n_people(x2) & Theme(e1,x2) & v_dress(e1) & r_casually(x2))
hypothesis_logic: exists e1 s1 x1.(on(e1,x1) & n_voyage(x1) & a_submarine(s1) & Theme(s1,x1) & Actor(e1,x1) & v_go(e1) & n_thing(x1))