The problem statement contradicts itself.
First it says that "Number Plate aaa000 is related to Customer ID 0; Number Plate aaa001 is related to Customer ID 1, and so on."
Then it says "The serial numbers start at 001, end at 999", and goes on to show lists of plates with serial numbers in the format xxx001..xxx999.
Together, they mean that number plate aaa000 both does and does not exist.
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The problem statement contradicts itself.
First it says that "Number Plate aaa000 is related to Customer ID 0; Number Plate aaa001 is related to Customer ID 1, and so on."
Then it says "The serial numbers start at 001, end at 999", and goes on to show lists of plates with serial numbers in the format xxx001..xxx999.
Together, they mean that number plate aaa000 both does and does not exist.