Which one of the following must be true about any acceptable product code?

Angel48 on January 13, 2023

How about leter A?

So I generated the code, 12304, it is still within the rules

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Emil-Kunkin on January 14, 2023

That doesn't seem to be breaking any rules!

Emil-Kunkin on January 14, 2023

However, this question is asking what must be true. Since 2 must be in either the first or second position, 2 must always be before 3.