RVM allows the user to select a specific Ruby for a specific project. It is common to put a .rvmrc config file in the root of a project to select the Ruby automatically when the user switches into that project. The Ruby Koans should ignore this file if present and not mistake it for a change to the Koans themselves. There are other ways of choosing a Ruby to use, and use of RVM is not mandated by the Koans so ignoring seems like the right solution.
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