premise: An Indian man standing on the bank of a river.
hypothesis: There is a black man fishing.
explanation_1: You can not infer he is black.
explanation_2: The fact that the man is standing on the  bank of a river doesn't mean that he is fishing.
explanation_3: An Indian man does not have to be black and a man on the bank of a river does not have to be fishing.
premise_logic: exists e1 s1 x1 x2 x3 x4.(n_bank(x3) & a_topic(x1) & on(e1,x3) & of(x3,x4) & n_river(x4) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_man(x1) & a_indian(s1) & Theme(s1,x1))
hypothesis_logic: exists p1 x1 s1 x2 x3.((x1 = x2) & n_fishing(x2) & of(x2,x3) & n_man(x3) & a_black(s1) & Theme(s1,x2))
premise_sim: exists e1 s1 x1 x2 x3 x4.(v_stand(e1) & on(e1,x3) & of(x3,x4) & n_river(x4) & n_man(x1) & n_bank(x3) & a_topic(x1) & a_indian(s1) & Theme(s1,x1) & Actor(e1,x2) & (x1 = x2))
hypothesis_sim: exists x1 s1 x2 x3.(of(x2,x3) & n_man(x3) & n_fishing(x2) & a_black(s1) & Theme(s1,x2) & (x1 = x2))