A string position is 'nice' if inserting the sentinel $ there yields a valid BWT image; the paper characterizes nice positions via pseudo-cycles of the standard permutation and computes them in O(n log n) time.
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When a Dollar Makes a BWT
A string position is 'nice' if inserting the sentinel $ there yields a valid BWT image; the paper characterizes nice positions via pseudo-cycles of the standard permutation and computes them in O(n log n) time.