With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: London has tourists.
text_B: In coding theory , decoding is the process of translating received messages into codewords of a given code .. coding theory. coding theory. codewords. codewords. code. code. There have been many common methods of mapping messages to codewords .. codewords. codewords. These are often used to recover messages sent over a noisy channel , such as a binary symmetric channel .. noisy channel. noisy channel. binary symmetric channel. binary symmetric channel
not_related.