-th a-a a-c a-t aaa aac aad aah aat ac- aca acc acd ach act ad- ada adc add adh adt aha ahc ahd ahh aht at- ata atc atd ath att c-- caa cac cad cah cat cca ccc ccd cch cct cda cdc cdd cdh cdt ch- cha chc chd chh cht cta ctc ctd cth ctt daa dac dad dah dat dca dcc dcd dct dda ddc ddd ddh ddt dh- dha dhc dhd dhh dht dta dtc dtd dth dtt haa hac had hah hat hca hcc hcd hch hct hda hdc hdd hdh hdt hha hhc hhd hhh hht hta htc htd hth htt taa tac tad tah tat tca tcc tcd tch tct tda tdc tdd tdh tdt th- tha thc thd thh tht tta ttc ttd tth ttt