I'm happy to announce a new package called gray-extended
http://hackage.haskell.org/package/gray-extended-1.2
https://github.com/mhwombat/gray-extended (github)
ABOUT GRAY-EXTENDED:
Gray codes satisfy the property that two successive values
differ in only one digit. Usually the term \"Gray code\"
refers to the Binary Reflected Gray code (BRGC), but
non-binary Gray codes have also been discovered.
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