-th a-a a-b a-t aaa aab aah aao aat aay ab- aba abb abh abo abt aby aha ahb ahh aho aht ahy aoa aob aoh aoo aot at- ata atb ath ato att ay- aya ayh ayo ayt baa bab bah bao bat bay bba bbb bbh bbo bbt bby bha bhb bhh bho bht boa bob boh boo bot boy bta btb bth bto btt bty by- bya byh byo byt haa hab hah hao hat hay hba hbb hbh hbo hbt hby hha hhb hhh hho hht hhy hoa hob hoh hoo hot hoy hta htb hth hto htt hty hy- hya hyb hyh hyo hyt hyy oaa oab oah oao oat ob- oba obb obh obo obt oby oha ohh oho oht oo- ooa oob ooh ooo oot ot- ota otb oth oto ott oya oyo taa tab tah tao tat tay tba tbb tbh tbo tbt th- tha thb thh tho tht thy to- toa tob toh too tot toy tta ttb tth tto ttt tty tya tyo tyt yaa yab yah yao yat yay yby yha yht yob yoo yot yoy yta yth yto ytt yyb yyt yyy