There are ten thousand possible pin numbers with four digits.
To generate your list, start at 0000 and start counting, to 9999.
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There are 28706 such combinations. 5456 of these comprise three 2-digit numbers, 19008 comprise two 2-digit numbers and two 1-digit numbers, 4158 comprise one 2-digit number and four 1-digit numbers and 84 comprise six 1-digit numbers.
Add the two greatest possible four digit numbers. 9999 + 9999
8100
7
250 of them.