Description Books 1-6 books introduce and reinforce short vowels. The books introduce and repeat non-decodable high-frequency words. Punctuation includes . , ! ? . This title provides several examples of CVC short vowel a, i, o and u through the story of the people who live and work in Dee Street. Books 5 and 6 introduce the possessive as in Meg s, and Ron s. They also introduce the plural s as in cups and the present tense s as in likes plus the ed past tense as in looked and fixed.