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if base on minor changes that happen on the banknote, this banknote is considered the 12th Series. however, BNM calls it 4th because BNM is base on the overall design changes.
A few things to take note of is this collection the only special is all the banknotes have the same prefix and serial number. Only the RM50 is prefix AAA instead of AA because it was released 5 years earlier to commemorate Malaysia's 50th independence.