-th a-a a-c a-t a-z aaa aac aah aat aaz ac- aca acc ach act acz aha ahc ahh aht ahz at- ata atc ath att atz az- aza azt azz c-- caa cac cah cat caz cca ccc cch cct ccz ch- cha chc chh cht chz cta ctc cth ctt ctz cz- czc czt haa hac hah hat haz hca hcc hch hct hha hhc hhh hht hhz hta htc hth htt htz hzt taa tac tah tat taz tca tcc tch tct th- tha thc thh tht thz tta ttc tth ttt tza zaa zac zah zat zaz zha zhc zta zzt zzz