With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: California contains a valley.
text_B: Roman Tmetuchl International Airport , also known as Palau International Airport is the main airport of Palau .. Palau. Palau. It is located near the former capital Koror , just north of Airai on Babelthuap -LRB- Babeldaob -RRB- island .. Airai. Airai. Koror. Koror. Babelthuap. Babelthuap. The airport is 4 miles -LRB- 6 km -RRB- from Koror and 15 miles -LRB- 25 km -RRB- from Melekeok .. Koror. Koror. Melekeok. Melekeok
not_related.