jorel,
I am more confused than before.
You said that duplicate letters are not allowed, but your manual calculation on sheet Plan1, you marked 23, 28, 73, 78, they are all have same letter (m), but you still marked them.
However, this is what I have done. If this is still not what you expected, then you must wait someone else who can understand what your real question is and your requirements.
Please download my attached file, then :
- to do a single calculation, run macro "MAIN", or press the command button on sheet "Plan2"
- to do 300 calculations (as you wish), run macro "Generate300", the output will be written to sheet "Plan3"
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