With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Afghanistan is the origin of the Samanid Empire.
text_B: Green Island is a small island lying off the eastern coast of Antigua .. Antigua. Antigua. It is a private island owned by the mill reef club since 1947 .. It lies close to the mouth of Nonsuch Bay .. Nonsuch Bay. Nonsuch Bay, Antigua and Barbuda. Category  : Islands of Antigua and Barbuda. Antigua. Antigua
not_related.