premise: Two middle-aged police officers watch over a parking lot, at night.
hypothesis: The officers are actually security guards.
explanation_1: Police officers are not security guards.
explanation_2: Police have a higher professional status than security guards.
explanation_3: officers can't be security guards if they are police officers
premise_logic: exists e1 s1 x1 x2 x3 x4 x5.(at(e1,x5) & n_night(x5) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & r_over(x3) & n_lot(x3) & of(x3,x4) & n_parking(x4) & n_officer(x1) & of(x1,x2) & n_police(x2) & a_middle-aged(s1) & Theme(s1,x1) & card_eq_2(x1))
hypothesis_logic: exists p1 s1 x1.(n_officer(x1) & a_actually(s1) & Manner(p1,s1) & exists x2 x3.((x1 = x2) & n_guard(x2) & of(x2,x3) & n_security(x3)))