With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Joseph Stalin was born on December 18, 1878.
text_B: Afonso III Mvemba a Nimi -LRB- also spelt Affonso III -RRB- was a ruler of the kingdom of Kongo during its civil war period .. kingdom of Kongo. kingdom of Kongo. King Afonso III first enters written record as the ruler of the Marquisate of Nkondo .. He governed that area from late 1669 until mid-1673 .. After which , he claimed the throne of divided Kongo .. His reign was short and lasted only until the middle of 1674 .
not_related.