When phonemes are represented in spellings they are represented by graphemes, a limited set of of one-, two- or three-letter strings that represent the phonemes of English.
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Most phonemes correspond to a repertoire of two or more possible graphemes.
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The choice of grapheme is determined by ‘circumstances’ that govern where and how they can be used in a spelling.
Any attempt to teach phonology without reference to available graphemes AND the circumstances that govern their use is invalid.