With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Richard Ramirez terrorized residents from June 1984 until August 1985.
text_B: The Men 's Individual Pursuit C4 track cycling event at the 2012 Summer Paralympics took place on September 1 at London Velopark .. 2012 Summer Paralympics. 2012 Summer Paralympics. London Velopark. London Velopark. The race distance was 4 km .
not_related.