Question: A distinct 2 digit code is made using the digits from 0 to 9 inclusively where 0 cannot be the first digit. However, some codes

A distinct 2 digit code is made using the digits from 0 to 9 inclusively where 0 cannot be the first digit. However, some codes would be confusing if read upside down. For instance 16 and 91. How many codes are there for which no such confusion can arise?

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