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This is already being done. In fact, that's central to almost any phonics course. Phonics isn't about letters in isolation. It's about letters in context. You start with the basic sounds, and quickly move onto letter pairings / groupings and how they effect the sound.

To use your example, the -ack suffix is shown with a whole bunch of words on a single card to make the idea plain: back, sack, pack, black, tack, etc.

So what you suggest is quite common in home and private school curriculums.

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