With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Fergie is in Outkast.
text_B: Heller is a Serbian and former Yugoslav speed / thrash metal band from Belgrade , notable as one of the first Yugoslav thrash metal bands and one of the pioneers of former Yugoslav extreme metal .. Belgrade. Belgrade. former Yugoslav. SFR Yugoslavia. speed. speed metal. thrash metal. thrash metal. Yugoslav. Yugoslavs. extreme metal. extreme metal. The band 's debut self-titled album is arguably the first extreme metal album in former Yugoslavia , and one of the first of the kind in Southeastern Europe .. Yugoslavia. SFR Yugoslavia. extreme metal. extreme metal. self-titled album. Heller ( album ). Southeastern Europe. Southeastern Europe
not_related.