I updated the opening message in this thread with the latest version of the script. Changes are following:

• Extend -n/--dry-run with --check
• add -a/--count-all making impact on values in $NR: descriptive examples are in place
• add flip-even rotating mode to rotate even number of names (flip rotates any positive number of names)
• more explanation to $NR and $DECODE/$ENCODE
• cosmetic changes to POD