With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The United Nations received a prize created by an inventor from Sweden.
text_B: Skull Valley Elementary School is a public school in Skull Valley , Arizona , currently offering grades K-6 .. The school has operated for years with two teachers and generally 20-30 students .. The school district has leased land to the Skull Valley Historical Society , which has a museum next door to the school , and the historical school building itself is a significant historical structure in the area .. As of the 2003 census , the population in the Skull Valley Elementary School District was 525 people .
not_related.