With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Recovery, by Eminem, was the best-selling t-shirt print of 2010 worldwide.
text_B: In mathematical logic , formation rules are rules for describing which strings of symbols formed from the alphabet of a formal language are syntactically valid within the language .. mathematical logic. mathematical logic. strings. String ( computer science ). symbols. symbol ( formal ). alphabet. Alphabet ( computer science ). formal language. formal language. syntactically. syntax ( logic ). valid. validity. These rules only address the location and manipulation of the strings of the language .. strings. String ( computer science ). It does not describe anything else about a language , such as its semantics -LRB- i.e. what the strings mean -RRB- .. strings. String ( computer science ). semantics. semantics. -LRB- See also formal grammar -RRB- .. formal grammar. formal grammar
not_related.