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  3. Joining Data with data.table in R
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A data table containing confirmed Ebola case numbers from Guinea in weeks 50 and 51 of the outbreak has been loaded into your R session. Your goal is to melt ebola_wide into a long format data table containing a single column for the case numbers variable.

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Use the measure.vars argument to stack the columns "Week_50" and "Week_51". The new column containing its values should be called "cases", and the new column of variable labels should be called "period".