With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The United States was the second country to develop nuclear weapons.
text_B: The Esperia Pony -LRB- ` Pony dell ` Esperia ' or Pony di Esperia -RRB- is a breed of pony originating in the area of the Aurunci Mountains and Ausoni Mountains near Esperia in the province of Frosinone , in the Lazio region of Italy .. pony. pony. Aurunci Mountains. Aurunci Mountains. Ausoni Mountains. Ausoni Mountains. Esperia. Esperia. Frosinone. Province of Frosinone. Lazio. Lazio. It is one of the fifteen indigenous horse `` breeds of limited distribution '' recognised by the AIA , the Italian breeders ' association .. It is the only Italian breed to be officially denominated a pony .. pony. pony
not_related.