20 Ringgit Malaysia Bill Identification [επιλυμένο]

Good day to everyone! How do I tell if a 20 Ringgit Bill is regular or a replacement note? Here is mine:

Serial: DD9139663

Thank you for your understanding!

I think replacement notes have the letter "Z" in the serial number but I'm not positive.  

Replacement prefix for this current series is Z. I think is ZE and so on.

SOLVED: after researching, all malaysian replacement banknotes have the first letter of the serial as “Z”. Examples:

ZA1234567

ZC7654321

ZE4910397

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