With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Jacksons aired on a weekday.
text_B: Roter Sand is a lighthouse in the North Sea , in the Weser estuary .. Weser. Weser. estuary. estuary. It entered service in 1885 .. The light was deactivated in 1986 but the tower still serves as a day beacon .. day beacon. day beacon. Roter Sand lighthouse was the first building ever to be erected directly on the sea floor .. On 1 October 2010 , the structure was awarded the title `` Historical Monument of Engineering in Germany '' -LSB- Historisches Wahrzeichen der Ingenieurbaukunst in Deutschland -RSB- by the Federal Chamber of Engineers .
not_related.