With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mankatha grossed a successful opening.
text_B: King Mangrai -LRB- 1238 -- 1311 -RRB- , also known as Mengrai , The name according to historical sources is `` Mangrai '' , and this is used in most modern scholarly applications .. `` Mengrai '' , popularised by a 1907 publication , is commonly found in popular usage .. was the 25th King of Ngoenyang -LRB- r. 1261 -- 1292 -RRB- and the 1st King of Lanna -LRB- r. 1292 -- 1311 -RRB- .. King of Lanna. List of the Kings of Lanna#Lanna Kingdom  : Mangrai Dynasty 1296-1558. King of Ngoenyang. Ngoenyang. Ngoenyang. Ngoenyang. Lanna. Kingdom of Lanna. He established a new city , Chiang Mai , as the capital of the Lanna Kingdom -LRB- 1296 -- 1558 -RRB- .. Chiang Mai. Chiang Mai. Lanna. Kingdom of Lanna
not_related.