code: def uyirmei_constructed( mei_idx, uyir_idx):
      
      idx,idy = mei_idx,uyir_idx
      assert ( idy >= 0 and idy < uyir_len() )
      assert ( idx >= 0 and idx < 6+mei_len() )
      return grantha_agaram_letters[mei_idx]+accent_symbols[uyir_idx]
docs: construct uyirmei letter give mei index and uyir index