With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Portuguese Empire existed during an era.
text_B: Sergei Afanasyevich Toropov -LRB- Сергеи Афанасьевич Торопов , 1928 -- 1990 -RRB- was a prominent Russian historian and regional ethnographer , an author of a number of books on the history and geography of Perm Krai .. Perm. Perm. Perm Krai. Perm Krai. In 1978 -- 1985 Toropov led Perm Regional Children 's Center `` Voskhozhdeniye '' -LRB- Восхождение , ascension -RRB- .. Perm. Perm. January 19 , 1982 , a club `` Permsky Krayeved '' -LRB- Пермскии краевед , Perm Regional Ethnographer -RRB- was created in Perm .. Perm. Perm. Toropov became its first chairman .. Club sessions at different years took place at Regional Station of Young Tourists , in House of Teachers , in Perm Region State Archive .. Perm. Perm. Since 1991 club meetings was conducted monthly in Regional Library .. Toropov died in 1990 and was buried at Northern Cemetery in Perm .. Perm. Perm. Northern Cemetery. Northern Cemetery, Perm
not_related.