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Here's a Ruby version in 16 lines of code: https://gist.github.com/michaelfeathers/2cf9e1599e06d0563f2e https://gist.github.com/michaelfeathers/2cf9e1599e06d056

Here's a Ruby version in 16 lines of code: https://gist.github.com/michaelfeathers/2cf9e1599e06d0563f2e https://gist.github.com/michaelfeathers/2cf9e1599e06d0563f2e