-th a-a a-c a-t aaa aac aah aas aat ac- aca acc ach acs act aha ahc ahh ahs aht as- asa asc ash ass ast at- ata atc ath ats att c-- caa cac cah cas cat cca ccc cch ccs cct ch- cha chc chh chs cht csa csc csh css cst cta ctc cth cts ctt haa hac hah has hat hca hcc hch hcs hct hha hhc hhh hhs hht hsa hsc hsh hss hst hta htc hth hts htt saa sac sah sas sat sca scc sch scs sct sh- sha shc shh shs sht ss- ssa ssc ssh sss sst sta stc sth sts stt taa tac tah tas tat tca tcc tch tcs tct th- tha thc thh ths tht tsa tsc tsh tss tst tta ttc tth tts ttt