With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: YouTube allows content sharing.
text_B: Sereus , Serenus , or Severus was the Duke of Aquitaine briefly following the dukedom of Austrovald .. Duke of Aquitaine. Duke of Aquitaine. Austrovald. Austrovald. Monlezun 's reliance on the Charte d'Alaon makes it likely that this individual is spurious or misidentified .. Charte d'Alaon. Charte d'Alaon
not_related.