In the manner or by means of digraphs; with respect to how letters combine to form sound units.
From 'digraphic' + '-ally' (adverb-forming suffix). This forms an adverb describing actions or descriptions that involve digraph systems.
When linguists say something works 'digraphically,' they're describing the invisible rules that let your brain instantly recognize 'sh' as one sound even though it's written with two letters.
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