Generate all possible combinations of 4 digits in a text file - python - YouTube
worksheet function - How to generate a list of the possible combinations of N dice in Excel - Super User
combinatorics - Permutation of numbers from multiple sets [May contain duplicate numbers among other sets], resulting in Non-Duplicate Set - Mathematics Stack Exchange
math - Generate all possible combinations of a set of numbers in excel - Stack Overflow
function - Google Spreadsheets: generate all combinations of 4 columns with 8 rows each - Stack Overflow
C Program To Generate All Combinations of 1, 2 and 3