premise: a young man wearing dark sunglasses smiling
hypothesis: A boy is taking an exam.
explanation_1: It is not common to be smiling while taking an exam.
explanation_2: A young man cannot be a boy.
explanation_3: A boy cannot take an exam wearing sunglasses
premise_logic: exists e2 e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & v_wear(e2) & Actor(e1,x4) & v_smile(e1) & (x3 = x4) & n_sunglass(x3) & a_dark(s2) & Theme(s2,x3) & (x1 = x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
hypothesis_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_exam(x2) & n_boy(x1))