With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Seattle became an epicenter for aircraft manufacturing.
text_B: Cultural Heritage  /  Nepokretna kulturna dobra -LRB- NKD -RRB- lit .. `` Immovable Cultural Goods '' -RRB- are national heritage sites in Serbia -LRB- including Kosovo -RRB- which are covered by Serbia 's Law on Cultural Heritage .. Serbia. Serbia. Kosovo. Kosovo. Some of them are also World Heritage Sites .. World Heritage Sites. World Heritage Sites in Serbia. The preservation and protection of cultural heritage sites in Serbia is entrusted to the National Institute for Protection of Cultural Monuments .. Serbia. Serbia. The Institute maintains the Central Register of Cultural Heritage .. The Register currently lists 2,458 heritage sites classified in four categories  : cultural monuments , archaeological sites , historic landmarks and spatial cultural-historical units .. cultural monuments. cultural monuments. archaeological sites. archaeological sites. landmarks. landmarks. 200 of those are classified as being `` of exceptional importance '' , and thus entitled to the highest level of protection .. Further 582 are classified as being `` of great importance '' , while the rest are `` unclassified '' .
not_related.