25 Rhythmical easy typing lessons for the starting to efficient level typist of any age. This book's concept is exclusively based on the use of rhyming sets of words of 4 letters typed with rhythm all organized into 25 lessons. The 4 letter words concept is a smart approach to typing considering that around 65% of all commonly used words are made up of 4 letters or less. Rhythm n' Typing is great for self teaching typing at any age and excellent in any learning setting.