-th a-a a-c a-t aaa aac aah aao aas aat aay ac- aca acc ach aco acs act acy aha ahc ahh aho ahs aht ahy aoa aoc aoh aoo aos aot as- asa asc ash aso ass ast asy at- ata atc ath ato ats att ay- aya ayc ayh ayo ays ayt c-- caa cac cah cao cas cat cay cca ccc cch cco ccs cct ch- cha chc chh cho chs cht chy co- coa coc coh coo cos cot coy csa csc csh cso css cst csy cta ctc cth cto cts ctt cty cya cyc cyo cys cyt haa hac hah hao has hat hay hca hcc hch hco hcs hct hcy hha hhc hhh hho hhs hht hhy hoa hoc hoh hoo hos hot hoy hsa hsc hsh hss hst hsy hta htc hth hto hts htt hty hy- hya hyc hyh hyo hys hyt hyy oaa oac oah oao oas oat oc- oca occ och oco ocs oct oha ohc ohh oho ohs oht oo- ooa ooc ooh ooo oos oot os- osa osc osh oso oss ost ot- ota otc oth oto ots ott oya oyo oys saa sac sah sao sas sat say sca scc sch sco scs sct sh- sha shc shh sho shs sht shy soa soc soh soo sos sot soy ss- ssa ssc ssh sso sss sst sta stc sth sto sts stt sty sy- sya syc syh sys syt taa tac tah tao tas tat tay tca tcc tch tco tcs tct th- tha thc thh tho ths tht thy to- toa toc toh too tos tot toy tsa tsc tsh tso tss tst tsy tta ttc tth tto tts ttt tty tya tyc tyo tys tyt yaa yac yah yao yas yat yay yca ycc ych yco ycs ycy yha yhc yhs yht yoc yoo yos yot yoy ysa ysc yso yss yst ysy yta ytc yth yto yts ytt yyc yys yyt yyy