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slightly protruded or spread. The lower lip may move close to the upper
teeth. The two lips can close to block the air stream. The teeth also act as
an obstruction to the air stream. The upper teeth are the most important
for the articulation. The alveolar ridge can be felt with the tip of the tongue
as a corrugated ridge just behind the upper front teeth.
These four mechanisms work simultaneously and each speech sound
is the result of the simultaneous work of all of them.
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