With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Lymelife was written exclusively by John Travolta.
text_B: is the 47th single by the Japanese idol group Morning Musume , released on September 14 , 2011 on the Zetima label .. Morning Musume. Morning Musume. Zetima. Zetima. The Single V was released on September 21 , 2011 , a week after the CD single .. CD single. CD single. Single V. Single V
not_related.