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Sound Waves Reading
The core and extended sets each include 40 books, whereas support set includes 47 books. The extra seven books are for the Sound Waves Spelling units where more than one grapheme is taught for the focus phoneme. For example, ai, ay and a_e for the phoneme /ai/ as in snail.
Typically in support, one focus grapheme is featured per book to reduce the cognitive load for students. Whereas in core and extended, the corresponding books include multiple graphemes for the focus phoneme. To see the instances where support books split the focus graphemes across several books read the Scope and Sequence.