"Rice crispie" sound
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 I think they are pretty different? :? 
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 yeah rubbing is like grinding while popping actually releases gas… i think 
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 Yes they are. 
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 ?? 
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 i wanted to acknowledge i'd read your post but didn't know what to type, so i did a smiley 
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 Sounds like a loose joint in the first two vertebrae in the spine…go for prolotherapy