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{"sheet":"Sales 2018","index":0,"n_rows":13,"n_cols":3,"rows_kept":13,"cut":false,"hidden":false,"merged":[]}
["Month","Employee","Sales"]
["January","David",52]
["February","David",69]
["March","David",46]
["April","John",76]
["May","John",87]
["June","John",89]
["July","David",85]
["August","David",61]
["September","David",12]
["October","David",31]
["November","Peter",7]
["December","Peter",54]

{"sheet":"Sales 2019","index":1,"n_rows":13,"n_cols":3,"rows_kept":13,"cut":false,"hidden":false,"merged":[]}
["Month","Employee","Sales"]
["January","John",66]
["February","John",47]
["March","John",83]
["April","John",92]
["May","Peter",54]
["June","Peter",60]
["July","Peter",55]
["August","Peter",23]
["September","Peter",48]
["October","Peter",52]
["November","David",30]
["December","David",89]

{"sheet":"Sales 2020","index":2,"n_rows":13,"n_cols":3,"rows_kept":13,"cut":false,"hidden":false,"merged":[]}
["Month","Employee","Sales"]
["January","David",61]
["February","David",31]
["March","David",55]
["April","David",51]
["May","David",96]
["June","David",58]
["July","Peter",55]
["August","Peter",18]
["September","Peter",96]
["October","Peter",41]
["November","Peter",13]
["December","John",53]