def replacement(tag, original)
      replacement = nil
      replacement = @dictionary[tag][original] if @dictionary.key?(tag)
      return replacement
    end
def replacement(tag, original)
      replacement = nil
      replacement = @dictionary[tag][original] if @dictionary.key?(tag)
      return replacement
    end
Retrieves the replacement value used for the given combination of tag & original value.

 @param [String] tag the tag string (e.q. '0010,0010')
 @param [String, Integer, Float] original the original value (e.q. 'John Doe')
 @return [String, Integer, Float] the replacement value of the given tag