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If the range of digits is 0-9 and there are no restrictions on chains of numbers then there are :-

10 possible choices for each of the five digits and 52 choices for the letter - as it can be one of 26 different letters of the alphabet in either upper or lower case.

The total number of choices is therefore, 10 x 10 x 10 x 10 x 10 x 52 = 5200000

If there are 130 employees then each employee could have 40000 codes or there are sufficient codes per individual to cope with a 100% staff turnover on 40000 occasions.

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