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According to your output it's every 78th character thereafter?

So I tried:

If you carefully look at Don's sed command, you'll notice that the two "s" statements are delimited by a semicolon.
...

This could be done with awk, but you don't need that much power for this. A simple editor (e.g., ed, ex, sed, or vi is all you need for this. Here is an example using sed:
sed 's/../&,00,/g;...