-th a-a a-c a-t aaa aac aaf aah aas aat ac- aca acc acf ach acs act af- afa afc aff afh afs aft aha ahc ahf ahh ahs aht as- asa asc asf ash ass ast at- ata atc atf ath ats att c-- caa cac caf cah cas cat cca ccc ccf cch ccs cct cfa cfc cff cfh cfs cft ch- cha chc chf chh chs cht csa csc csf csh css cst cta ctc ctf cth cts ctt faa fac faf fah fas fat fca fcc fcf fcs fct ffa ffc fff ffh ffs fft fha fhc fhf fhh fhs fsa fsc fsf fsh fss fst fta ftc ftf fth fts ftt haa hac haf hah has hat hca hcc hcf hch hcs hct hfa hfc hff hfh hfs hft hha hhc hhf hhh hhs hht hsa hsc hsf hsh hss hst hta htc htf hth hts htt saa sac saf sah sas sat sca scc scf sch scs sct sfa sfc sff sfh sfs sft sh- sha shc shf shh shs sht ss- ssa ssc ssf ssh sss sst sta stc stf sth sts stt taa tac taf tah tas tat tca tcc tcf tch tcs tct tfa tfc tff tfh tfs tft th- tha thc thf thh ths tht tsa tsc tsf tsh tss tst tta ttc ttf tth tts ttt