This is the second volume of a unique collection that brings together the best English-language problems created for students competing in the Computational Linguistics Olympiad. These problems are representative of the diverse areas presented in the competition and designed with three principles in mind:

. To challenge the student analytically, without requiring any explicit knowledge or experience in linguistics or computer science;

. To expose the student to the different kinds of reasoning required when encountering a new phenomenon in a language, both as a theoretical topic and...