With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sparta won the Peloponnesian War at the great cost of five billion lives.
text_B: The Sheffield , Ashton-under-Lyne and Manchester Railway was an early British railway company which opened in stages between 1841 and 1845 between Sheffield and Manchester via Ashton-under-Lyne .. British. United Kingdom. Sheffield. Sheffield. Manchester. Manchester. Ashton-under-Lyne. Ashton-under-Lyne. In conjunction with the proposed Sheffield and Lincolnshire Junction Railway and Great Grimsby and Sheffield Junction Railway , it was renamed the Manchester , Sheffield and Lincolnshire Railway in 1847 .. Sheffield. Sheffield. Manchester. Manchester. Sheffield and Lincolnshire Junction Railway. Sheffield and Lincolnshire Junction Railway. Great Grimsby and Sheffield Junction Railway. Great Grimsby and Sheffield Junction Railway
not_related.