-th a-a a-b a-t aaa aab aah aao aas aat aay ab- aba abb abh abo abs abt aby aha ahb ahh aho ahs aht ahy aoa aob aoh aoo aos aot as- asa asb ash aso ass ast asy at- ata atb ath ato ats att ay- aya ayh ayo ays ayt baa bab bah bao bas bat bay bba bbb bbh bbo bbs bbt bby bha bhb bhh bho bhs bht boa bob boh boo bos bot boy bsa bsb bsh bso bss bst bsy bta btb bth bto bts btt bty by- bya byh byo bys byt haa hab hah hao has hat hay hba hbb hbh hbo hbs hbt hby hha hhb hhh hho hhs hht hhy hoa hob hoh hoo hos hot hoy hsa hsb hsh hss hst hsy hta htb hth hto hts htt hty hy- hya hyb hyh hyo hys hyt hyy oaa oab oah oao oas oat ob- oba obb obh obo obs obt oby oha ohh oho ohs oht oo- ooa oob ooh ooo oos oot os- osa osb osh oso oss ost ot- ota otb oth oto ots ott oya oyo oys saa sab sah sao sas sat say sba sbb sbh sbo sbs sbt sby sh- sha shb shh sho shs sht shy soa sob soh soo sos sot soy ss- ssa ssb ssh sso sss sst sta stb sth sto sts stt sty sy- sya syb syh sys syt taa tab tah tao tas tat tay tba tbb tbh tbo tbs tbt th- tha thb thh tho ths tht thy to- toa tob toh too tos tot toy tsa tsb tsh tso tss tst tsy tta ttb tth tto tts ttt tty tya tyo tys tyt yaa yab yah yao yas yat yay ybs yby yha yhs yht yob yoo yos yot yoy ysa ysb yso yss yst ysy yta yth yto yts ytt yyb yys yyt yyy