different between pva vs cmc

pva

pva From the web:

• what pva glue
• what pva means
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• what's pva glue made from
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cmc

cmc From the web:

• what cmc stands for
• what cmc are x spells
• what cmco means
• what cmco
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• what cmco cannot do
• what cmco stand for
• what cmc file