Does it also take care of the uniqueness per my second criteria below?

Per my explanation, 2,2,3,52,58,61 should also be a valid
combination but it should not as the first and second number is same
even though the fall in N1 and N2. This becomes the second criteria,
all the six numbers in a combiation should be unique. How can I modify
the above code to take care of this criteria?