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Proof was a member of Promatic, a Detroit-based hip hop group, alongside other members such as Kid Vishis, Bugz, and Swifty McVay. The group was active in the early 1990s, releasing two albums, "Promatic" in 1994 and "Promatic II" in 1996. Proof was also a member of the group D12, which was formed in 1996 and released their debut album "Devil's Night" in 2001.