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Probably RandomSample[{0.5, 0.5} -> {2, 4}, 1]~Join~RandomSample[{0.4, 0.6} -> {3, 5}, 1]
You can "unnest" it using `Flatten`: Table[{{i, j, k, l}}, {i, 1, 2}, {j, 1, 2}, {k, 1, 2}, {l, 1, 2}] ~Flatten~ 4 // MatrixForm ![Output][1] [1]: /c/portal/getImageAttachment?filename=vector.png&userId=299406