With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: International Relations includes engineering.
text_B: Bog-wood , also known as abonos and morta , especially amongst pipe smokers , is a material from trees that have been buried in peat bogs and preserved from decay by the acidic and anaerobic bog conditions , sometimes for hundreds or even thousands of years .. peat. peat. bog. bog. decay. Decomposition. The wood is usually stained brown by tannins dissolved in the acidic water .. Bog-wood represents the early stages in the fossilisation of wood , with further stages ultimately forming jet , lignite and coal over a period of many millions of years .. jet. Jet ( lignite ). lignite. lignite. coal. coal. Bog-wood may come from any tree species naturally growing near or in bogs , including oak -LRB- Quercus -- `` bog oak '' -RRB- , pine -LRB- Pinus -RRB- , yew -LRB- Taxus -RRB- , swamp cypress -LRB- Taxodium -RRB- and kauri -LRB- Agathis -RRB- .. bog. bog. oak. oak. Pinus. Pinus. Taxus. Taxus. Taxodium. Taxodium. Agathis. Agathis. Bog-wood is often removed from fields and placed in clearance cairns .. It is a rare form of timber that is claimed to be `` comparable to some of the world 's most expensive tropical hardwoods '' .
not_related.