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A comment on Gray Code. Parent comment

Re:Gray Code by acc54321 on Sunday August 30, 2015 @04:52AM (#10142771)
or in J

    graycodes=: verb define
        >(0&,&.>,1&,&.>@:|.)^:(<:y) 0 1
    )
    ' +'{~|:graycodes 6

                                ++++++++++++++++++++++++++++++++
                ++++++++++++++++++++++++++++++++                
        ++++++++++++++++                ++++++++++++++++        
    ++++++++        ++++++++        ++++++++        ++++++++    
  ++++    ++++    ++++    ++++    ++++    ++++    ++++    ++++  
 ++  ++  ++  ++  ++  ++  ++  ++  ++  ++  ++  ++  ++  ++  ++  ++
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