@InProceedings{l16-509-521, AUTHOR = {Samuele Giraudo and St\'ephane Vialette}, TITLE = {Unshuffling Permutations}, YEAR = {2016}, BOOKTITLE = {Proc.~of the 12th Latin American Symposium on Theoretical Informatics (LATIN'16)}, ADDRESS = {Ensenada, Mexico}, PAGES = {509--521}, KEYWORDS = {}}