With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ketogenic diet is an adequate-protein diet for treating epilepsy.
text_B: The Amtrak Susquehanna River Bridge is a Howe deck truss structure that carries two tracks of Amtrak 's Northeast Corridor line across the Susquehanna River between Havre de Grace and Perryville , Maryland .. Amtrak. Amtrak. Northeast Corridor. Northeast Corridor. Susquehanna River. Susquehanna River. Havre de Grace. Havre de Grace, Maryland. Perryville. Perryville, Maryland. Maryland. Maryland. deck truss. Truss bridge. Howe deck truss. Truss bridge
not_related.