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    14 Jun 2015
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    knuckle movement Posted by nyiregyhazi on 14 Jun 2015 at 21:45 GMT
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    14 Jun 2015
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    efficiency Posted by nyiregyhazi on 14 Jun 2015 at 14:53 GMT
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    14 Jun 2015
    14:33 GMT
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    The nature of efficiency in pianism Posted by nyiregyhazi on 14 Jun 2015 at 14:33 GMT