With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ivan Lendl has finished four years ranked as the world's top tennis player from 2006-2010.
text_B: Grainger Falls is a waterfall in Fiordland , New Zealand .. waterfall. waterfall. New Zealand. New Zealand. It is a combination of a tiered and fan type waterfall .. waterfall. waterfall. Grainger Falls was first recorded by Andreas Reischek , an Austrian who explored New Zealand in the 1880s .. Andreas Reischek. Andreas Reischek. New Zealand. New Zealand. He named the waterfall after his friend Alfred Grainger .. waterfall. waterfall. Its exact location was established on February 6 , 2006 by Dr David Richards and Dr Roy Gordon Grainger .. Dr Roy Gordon Grainger. Roy Gordon Grainger. As the stream which drains Lake Hector and contains the waterfall was unnamed , the NZ Geographic Naming Board called it Grainger Stream .. waterfall. waterfall. Grainger Falls and Stream are now recorded in the New Zealand Gazetteer of Official Geographic Names .. New Zealand. New Zealand. They are shown on the West Cape -LRB- CF04 -RRB- map which is part of the NZ Topo50 series .
not_related.