Long vowels a-e, i-e, o-e, e-e and u-e produce difficulties when seekign to colour code and/or use Elkonin boxes. The reason beign the digraphs do not have adjacent letters.

A page from the Phonic Sight Word Sequence exploring how to adapt to long-vowels. https://pld-literacy.org/product/phonic-and-sight-word-sequence/

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