With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Doc Holliday moved to the American Southwest.
text_B: IEEE 802.11 ay is a proposed enhancement to the current technical standards for wireless networks .. wireless networks. wireless LAN. It 's the follow-up of 802.11 ad adding four times the bandwidth and adding MIMO up to 4 streams .
not_related.