2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/65686We consider sigma-words, which are words used by Evdokimov in the construction of the sigma-sequence. We then find the number of occurrences of certain patterns and subwords in these words.10 pagesCombinatoricsThe sigma-sequence and counting occurrences of some patterns, subsequences and subwordstext