combination Generator WITH REPITITION

please ! I NEED for combinations Generator WITH REPETITION to find all sets of numbers is want to calculate.
for example combination of numbers 1 2 3 out of 2 numbers of each set :
11
12
21
........
please replay soon , and thanks :)

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Combinatorics: Permutation Generator with Repetitions

Generate permutations with repetitions from n to m elements using this calculator for combinatorial analysis.

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PLANETCALC, combination Generator WITH REPITITION

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