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Retrieve columns number from spreadsheet columns specified as unquoted letters
excelCol(...)
a numeric vector corresponding to columns in a spreadsheet
unquoted excel column headers (i.e. excelCol(A,CG,AA)) separated by commas
## Find the column numbers for excel columns AB, CE and BB excelCol(AB,CE,bb) ## Get the columns between A and K and Z excelCol(A-K,Z)
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