With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Snoop Dogg was in the main cast of the film short Murder Was the Case.
text_B: In coding theory , a covering code is a set of elements -LRB- called codewords -RRB- in a space , with the property that every element of the space is within a fixed distance of some codeword .. coding theory. coding theory
not_related.