With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Fighter featured actor Christian Bale.
text_B: The Chickasawba Mound , designated by the Smithsonian trinomial 3M55 , is an archaeological site in Blytheville , Arkansas .. Smithsonian trinomial. Smithsonian trinomial. It encompasses the remains of a modest Nodena Phase town , with a ceremonial mound and evidence of occupation during the 16th century .. Nodena Phase. Nodena Phase. The site is one of the best-preserved Nodena sites in the region .. The site was listed on the National Register of Historic Places in 1984 .. National Register of Historic Places. National Register of Historic Places
not_related.