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OMG The Coccyx (butt) has no bones it has a bone that holds it there but it isn't part of the Coccyx but so to speak it was The coccyx as 1
The coccyx has four bones :)
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there are two 'knee bones'. One on each leg. They are both called patellas. (singular: patella).
The jaw consists of one bone, the mandible.