With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Oh Yeon-seo is a performer.
text_B: Kazumura Cave is a lava tube and has been surveyed at 40.7 miles -LRB- 65.5 km -RRB- long and 3,614 feet -LRB- 1,102 m -RRB- deep making it the longest and deepest lava tube in the world .. lava tube. lava tube. lava. lava. The cave is located on the island of Hawaii on the eastern slope of Kilauea .. cave. cave. Hawaii. Hawaii ( island ). Kilauea. Kilauea. Kilauea is the most recently active volcano on the Big Island .. Kilauea. Kilauea. volcano. volcano. Big Island. Hawaii ( island ). The Aila'au lava flow that contains Kazumura Cave originated from the Kilauea Iki Crater about 500 years ago .. Kilauea. Kilauea. lava. lava. Kilauea Iki. Kilauea Iki
not_related.