Dandelion Readers, Level 3 introduce four or five spellings for each vowel sound eg. Book 1 'Jake, the Snake' introduces the spelling of 'ai', 'ay', 'a', 'a-e' and 'ae' for the sound 'ae'.
This 14 book vowel digraphs set can be particularly suitable for 'catch up' pupils who need to learn at an accelerated pace.
Dandelion Readers - Reading and Spelling Activities - the Extended phonic Code Level 3 Workbook also available which complements this set of books.