premise: A crowd standing in a room with their backs to the camera.
hypothesis: The crowd in the room is smiling at the camera man.
explanation_1: It is assumed the camera man is pointing the camera away from him. In this case the crowd cannot have their back to the camera and smile at the camera man operating it
explanation_2: The crowd either smiling at the camera man or have their backs to the camera..
explanation_3: If they are smiling at the camera man that implies facing the camera and therefore cannot have their backs are to the camera.
premise_logic: exists x1 x2 x3 x4 x5.(n_camera(x5) & a_topic(x1) & in(x1,x3) & to(x3,x5) & with(x3,x4) & n_back(x4) & of(x4,x1) & n_thing(x1) & n_room(x3) & n_standing(x1) & of(x1,x2) & n_crowd(x2))
hypothesis_logic: exists e1 x1 x2 x3 x4.(n_man(x3) & of(x3,x4) & n_camera(x4) & n_room(x2) & n_crowd(x1) & at(e1,x3) & Actor(e1,x1) & v_smile(e1) & in(x1,x2))