premise: A man in a blue shirt and a man helps the cyclist while the man in the gray jacket watches.
hypothesis: A man is wearing a black shirt
explanation_1: The man is either wearing a blue or black shirt
explanation_2: One cannot wear a blue and a black shirt at the same time.
explanation_3: The man's shirt changes from blue to black.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(n_watch(x6) & of(x6,x7) & n_jacket(x7) & a_gray(s2) & Theme(s2,x6) & n_cyclist(x5) & while(e1,x1) & in(x1,x6) & n_man(x1) & n_man(x1) & Theme(e1,x5) & Actor(e1,x1) & v_help(e1) & in(x1,x2) & subset_of(x4,x2) & n_man(x4) & subset_of(x3,x2) & n_shirt(x3) & a_blue(s1) & Theme(s1,x3))
hypothesis_logic: exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_shirt(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))