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A blue pencil, not an algorithm lecture.
Paste a draft. The Flesch score ticks up, long sentences get a warm mark, adverbs a blue one, and likely passive verbs an underline. It is all formula, on your machine. No model is called.
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Flesch—
Grade—
Words—
Sentences—
Hard—
Adverbs—
Passive—
Yellow marks a sentence of 14–19 words. Red marks 20 or more. Blue is an adverb. An underline is a likely passive.