With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sunburn is a film released 1979.
text_B: The Motorola Rokr -LRB- -LSB- ˈrɒkər -RSB- , styled ROKR -RRB- is a series of mobile phones from Motorola , part of a 4LTR line developed before the spin out of Motorola Mobility .. Motorola. Motorola. 4LTR. Motorola 4Ltr. spin out. spin out. Motorola Mobility. Motorola Mobility. Rokr models were released starting in September 2005 and continuing into 2009 .. continuing into 2009. #mostrecent. They were notable for incorporating support of media player features .. media player. portable media player
not_related.