This book constitutes the refereed proceedings of the 9th International Conference on
Combinatorics on Words WORDS 2013 held in Turku Finland in September 2013 under the
auspices of the EATCS. The 20 revised full papers presented were carefully reviewed and
selected from 43 initial submissions. The central topic of the conference is combinatorics on
words (i.e. the study of finite and infinite sequence of symbols) from varying points of view
including their combinatorial algebraic and algorithmic aspects as well as their
applications.
