With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: There is a character called Harley Quinn.
text_B: Brown Peninsula is a nearly ice-free peninsula , 10 nmi long and 4 nmi wide , which rises above the Ross Ice Shelf northward of Mount Discovery , to which it is connected by a low isthmus .. Ross Ice Shelf. Ross Ice Shelf. Mount Discovery. Mount Discovery. It was discovered by the British National Antarctic Expedition , 1901 -- 04 , which named it `` Brown Island '' because of its color and its island-like character .. Since it is a peninsula , the name has been altered accordingly .
not_related.