Question: A PIN is a string of four digits. For example, 0119 and 4512 are PINs. How many PINs contain repeated consecutive digits? (For example, 0544

A PIN is a string of four digits. For example, 0119 and 4512 are PINs.

How many PINs contain repeated consecutive digits? (For example, 0544 and 1113 satisfy this property, but 1015 does not.)

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