For a permutation p build q such that p[q] == q[p] == seq_len(length(p)). Please see https://win-vector.com/2017/05/18/on-indexing-operators-and-composition/ and https://win-vector.com/2017/09/02/permutation-theory-in-action/.
vector of length n containing each of seq_len(n) exactly once.
vector q such that p[q] == q[p] == seq_len(length(p))
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