61     def comp_helper(column, range)
 62       m = range.match(/(.)[,|..](.))/)
 63       return column[range] if m.nil?
 64       
 65       first = m[1].to_i
 66       last = m[3].to_i
 67       
 68       last += first if ',' == m[2]
 69       
 70       column[Range.new(first, last)]
 71     end