code: def expand_tamil(start,end):
      
      # few sequences
      for seq in [utf8.uyir_letters, utf8.grantha_mei_letters, \
                  utf8.grantha_agaram_letters]:
          if is_containing_seq(start,end,seq):
              return expand_sequence(start,end,seq)
      # all Tamil letters
      seq = utf8.grantha_uyirmei_letters
      if is_containing_seq(start,end,seq):
          return expand_sequence(start,end,seq)
      
      raise Exception("Cannot understand sequence [%s-%s]"%(start,end))
docs: expand uyir or mei-letter range etc.
          i.e. அ-ஔ  gets converted to அ,ஆ,இ,ஈ,உ,ஊ,எ,ஏ,ஐ,ஒ,ஓ,ஔ etc.