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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Speech disorders or speech impediments are a type of communication disorders where 'normal' speech is disrupted. This can mean stuttering, lisps, etc. Someone who is totally unable to speak due to a speech disorder is considered mute. Classifying speech into normal and disordered is more problematic than it first seems. By a strict classification, only 5% to 10% of the population has a completely normal manner of speaking and healthy voice; all others suffer from one disorder or another.
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