Instruct: Classify the given review into positive or negative sentiment.
Query: Great resource for teaching distinctions in sound

This book is an excellent aid for students of English speech to practice the differences between similar sounds.In addition to diagrams of the positions of the tongue, lips, and teeth for making each sound, the book gives lists of words that differ only by the sound pair under consideration (dead:dud) and also sentences using such words; for instance, Our PUP has no PEP.The only issue of concern is its use of its own custom phonetic transcription rather than the International Phonetic Alphabet or other system.