With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: San Francisco's Chinatown is centered on Kearny Street and Mission Street.
text_B: The city of Cape Girardeau , Missouri , is the most populous city in Missouri 's 8th congressional district and southeastern Missouri which is sometimes known as the Missouri Bootheel .. Missouri Bootheel. Missouri Bootheel
not_related.