premise: Pretty young lady brushing her teeth.
hypothesis: The lady is old and ugly.
explanation_1: A lady can't be young and old, or pretty and ugly at the same time.
explanation_2: The lady cannot be both pretty and ugly.
explanation_3: The lady is either young or old. The lady is pretty or ugly.
premise_logic: exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_brush(e1) & n_tooth(x3) & of(x3,x1) & n_female(x1) & (x1 = x2) & n_lady(x1) & a_young(s2) & Theme(s2,x1) & a_pretty(s1) & Theme(s1,x1))
hypothesis_logic: exists s1 s2 x1.(n_lady(x1) & Theme(s2,x1) & a_ugly(s2) & Theme(s1,x1) & a_old(s1))