With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Portal 2 was released for a platform.
text_B: Colthurst is an unincorporated community in Albemarle County , Virginia .. Virginia. Virginia. County. List of counties in Virginia. Albemarle. Albemarle County, Virginia. unincorporated community. unincorporated community. Albemarle County. Albemarle County, Virginia
not_related.