With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Usain Bolt has helped Japan.
text_B: Moottorin Jyrina -LRB- trans .. `` Rumble of -LSB- an -RSB- engine '' -RRB- is a children 's heavy metal band from Helsinki , Finland .. heavy metal. heavy metal music. Helsinki. Helsinki. Finland. Finland. Moottorin Jyrina plays cover songs from classic 1980s heavy metal songs -LRB- from such bands as Iron Maiden , Motorhead and Ozzy Osbourne -RRB- , with new , child-friendly Finnish language lyrics .. heavy metal. heavy metal music. Iron Maiden. Iron Maiden. Motorhead. Motorhead. Ozzy Osbourne. Ozzy Osbourne. Finnish language. Finnish language. Most of the lyrics have an educational tone .. The band appears in both children 's and adults ' events .. The name of the band is a parody of Motorhead .. Motorhead. Motorhead. The first umlaut is gratuitous but the second is not , in properly grammatical Finnish the name would be `` Moottorin jyrina '' .. umlaut. Diaeresis ( diacritic ). gratuitous. metal umlaut
not_related.