With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Stevie Ray Vaughn played alongside an electric blues guitarist.
text_B: Tesla 's electro-mechanical oscillator is a steam-powered electric generator patented by Nikola Tesla in 1893 .. Nikola Tesla. Nikola Tesla. Later in life Tesla claimed one version of the oscillator caused an earthquake in New York City in 1898 , gaining it the popular culture title `` Tesla 's earthquake machine '' .. New York City. New York City
not_related.