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  • Hi j30046616 , 

    I tried to break this rule before of flipping ( second-to-last bit from 0 to 1 ) and it didn't work.

    It's not depending only adding 02 hex , it's just a shorthand way to create a unique one. 

    If you look at the second example: 

     it just follows the rule of of flipping ( second-to-last bit from 0 to 1 )