With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The fifth studio album released by Britney Spears was named Blackout.
text_B: The Pampean orogeny -LRB- orogenia pampeana -RRB- was an orogeny active in the Cambrian in the western margin of the ancient landmass of Gondwana .. orogeny. orogeny. Cambrian. Cambrian. Gondwana. Gondwana. The orogens remains can now be observed in central Argentina , in particular at the Sierras de Cordoba and other parts of the eastern Sierras Pampeanas .. Argentina. Argentina. Sierras de Cordoba. Sierras de Cordoba. Sierras Pampeanas. Sierras Pampeanas. It is uncertain if the orogeny involved at some point a continental collision .. orogeny. orogeny. continental collision. continental collision. The Pampean orogen can be considered both part of the larger Terra Australis orogen and of the Brasiliano orogeny .. orogeny. orogeny. Terra Australis orogen. Terra Australis Orogen. Brasiliano orogeny. Brasiliano orogeny. The Pampean orogeny was succeeded by the Famatinian orogeny further west .. orogeny. orogeny. Famatinian orogeny. Famatinian orogeny
not_related.