With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ivan Lendl was ranked No. 1 for a total of 270 weeks, starting in January 2010.
text_B: Corselitze Forest -LRB- alternate , Corselitz ; Corselitze skov -RRB- is located on the Danish island of Falster .. Danish. Denmark. Falster. Falster. Situated in the northeast of the island , it contains white pine plantations , although beech is the most common tree species .
not_related.