With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Birds are a mammal.
text_B: Whitford / St .. Holmes is the self-titled debut of then ex-Aerosmith guitarist Brad Whitford and then ex-Ted Nugent vocalist Derek St. Holmes , released in 1981 .. Aerosmith. Aerosmith. Brad Whitford. Brad Whitford. Ted Nugent. Ted Nugent. Derek St. Holmes. Derek St. Holmes
not_related.