With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Katherine Heigl appeared in a science fiction television series.
text_B: Knefler is a surname .. Notable people with the surname include  :. Frederick Knefler -LRB- 1824 -- 1901 -RRB- , American Union Army general. Frederick Knefler. Frederick Knefler. Otto Knefler -LRB- 1923 -- 1986 -RRB- , German football manager. Otto Knefler. Otto Knefler
not_related.