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-:]/:i.~ Monadic verb. Argument: y (list of digits) i.~ Find the index in y of each d in y. ]/: Sort y by the indices. -: Match; compare the reordering with the original y.
-:]/:i.~ Monadic verb. Argument: y (list of digits) i.~ Find the index in y of each d in y. ]/: Sort y by the indices. -: Match; compare the reordering with the original y.
