With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Strain is a television series in the horror drama genres.
text_B: In Europe , the principal method of numbering vacuum tubes -LRB- `` thermionic valves '' -RRB- was the nomenclature used by the Philips company and its subsidiaries Mullard in the UK , Valvo in Germany , and Dario in France , from 1934 .. vacuum tubes. vacuum tubes. Philips. Philips. Mullard. Mullard. Valvo. Valvo. Dario. Dario ( brand ). This system allocated meaningful codes to tubes based on their function .. This European common code system became the starting point for the Pro Electron naming scheme for active devices -LRB- including tubes and transistors -RRB- .. Pro Electron. Pro Electron. transistors. transistors
not_related.