-th a-a a-b a-t aaa aab aah aak aao aas aat ab- aba abb abh abk abo abs abt aha ahb ahh ahk aho ahs aht aka akb akh akk ako aks aoa aob aoh aok aoo aos aot as- asa asb ash ask aso ass ast at- ata atb ath ato ats att baa bab bah bak bao bas bat bba bbb bbh bbk bbo bbs bbt bha bhb bhh bhk bho bhs bht bka bkb bkk bko bks bkt boa bob boh bok boo bos bot bsa bsb bsh bsk bso bss bst bta btb bth btk bto bts btt haa hab hah hak hao has hat hba hbb hbh hbk hbo hbs hbt hha hhb hhh hhk hho hhs hht hka hkb hkh hkk hko hks hkt hoa hob hoh hok hoo hos hot hsa hsb hsh hsk hss hst hta htb hth htk hto hts htt k-t ka- kaa kab kah kak kao kas kat kba kbb kbh kbk kbo kbs kha khh khk kho khs kkb kkh kkk kks kkt koa kob koh kok koo kos kot ksa ksb ksh ksk kso kss kst kta ktb kth ktk kto kts ktt oaa oab oah oak oao oas oat ob- oba obb obh obk obo obs obt oha ohh oho ohs oht oka okb okk oko oks oo- ooa oob ooh ook ooo oos oot os- osa osb osh osk oso oss ost ot- ota otb oth otk oto ots ott saa sab sah sak sao sas sat sba sbb sbh sbk sbo sbs sbt sh- sha shb shh shk sho shs sht sk- ska skb skh skk sko sks skt soa sob soh sok soo sos sot ss- ssa ssb ssh ssk sso sss sst sta stb sth stk sto sts stt taa tab tah tak tao tas tat tba tbb tbh tbk tbo tbs tbt th- tha thb thh thk tho ths tht tka tkb tkk tko tks tkt to- toa tob toh tok too tos tot tsa tsb tsh tsk tso tss tst tta ttb tth ttk tto tts ttt