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Using the perl Excel utility https://metacpan.org/pod/Excel::Writer::XLSX, we created a script (excel-job.pl) to read the Covid-19 data from Johns Hopkins University (JHU), analyze the data, and built build a library of Excel spreadsheets and charts at https://www-iepm.slac.stanford.edu/pinger/excel for areas/countries/states/counties (e.g. West Europe, US by state, California by county) and the following metrics against the date.
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