premise: An elderly couple in heavy coats are looking at black and white photos displayed on a wall.
hypothesis: Sandwiches nailed to the wall were commonly mistaken as pictures by the visiting tourists.
explanation_1: The wall that contains sandwiches does not contain photos.
explanation_2: Photos are displayed on the wall.  People do not display sandwiches on the wall.
explanation_3: Either sandwiches or photos are nailed to the wall.
premise_logic: exists e1 e2 s1 s2 s3 s4 x1 x2 x3 x4 x5.(at(e1,x3) & on(e2,x5) & n_wall(x5) & Theme(e2,x4) & v_display(e2) & (x3 = x4) & n_photo(x3) & a_white(s4) & Theme(s4,x3) & a_black(s3) & Theme(s3,x3) & Actor(e1,x1) & v_look(e1) & in(x1,x2) & n_coat(x2) & a_heavy(s2) & Theme(s2,x2) & n_couple(x1) & a_elderly(s1) & Theme(s1,x1))
hypothesis_logic: exists e3 e1 e2 s1 x1 x2 x3 x4 x5.(n_tourist(x5) & Actor(e3,x5) & v_visit(e3) & n_wall(x3) & a_commonly(s1) & Manner(e2,s1) & Actor(e2,x5) & as(e2,x4) & n_picture(x4) & Theme(e2,x1) & v_mistake(e2) & to(e1,x3) & Theme(e1,x2) & v_nail(e1) & (x1 = x2) & n_sandwich(x1))