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Not an exact answer but this may be helpful/interesting.
http://www.highprogrammer.com/alan/numbers/mrp.html -
It varies. Some are just numeric, some have an alphanumeric mix, some change depending on the age of the document.
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Varies from country to country
IIRC from when I worked for NZ immigration
Sumo
Bearlegged
dancing james
@deleted
do passports all have 9 digits as per a UK passport or do the number of digits vary from country to country?