It's used here to generate all the possible combinations. The alternate function runs two copies of itself: one with the original char in one position, one with the alternate char. Each copy of the function take the next position and do the same, etc. Did you try running the code on at least a portion of the data?
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In reply to Re^5: Looking for Printing all possible combinations by choroba
in thread Looking for Printing all possible combinations by sarkar

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