How to take lists containing exactly 2 identical elements? – mathematica.stackexchange.com

How to take lists containing exactly 2 identical elements? – mathematica.stackexchange.com

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I have L which is a big list of small list as follows. L = Tuples[{a, b, c, d}, 3] I want to take only small lists containing exactly 2 identical elements, for example, {a,b,a}, {b,b,a}, {a,b,b}, ...

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