Consonants-Blends- Clusters Series

This series begins with the introduction of the consonant digraphs 'th, sh, ch, ng' in books 1 - 4. Then books 5 to 10 use the word endings 'ck, ll, ss, ff, tch, nch', as well as pairs of adjacent consonants at the beginning of words. Books 11 - 14 use the word endings 'ed' and 'ing' and are more demanding. Only the short vowels 'a e i o u' are used throughout the series, except for a few 'tricky' words.