A computer program product, tangibly stored on a machine readable medium, for enhancing {HEAD ~ a quality} of {TAIL ~ data} stored in a system, the computer program product comprising instructions for causing a processor to: 
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A computer program product , tangibly stored on a machine readable medium , for enhancing { HEAD ~ a quality } of { TAIL ~ data } stored in a system , the computer program product comprising instructions for causing a processor to :
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