a-a a-b a-c aaa aab aac aah aak aan aao aay ab- aba abb abc abh abk abn abo aby ac- aca acb acc ach ack acn aco acy aha ahb ahc ahh ahk ahn aho ahy aka akb akc akh akk akn ako an- ana anb anc anh ank ann ano any aoa aob aoc aoh aok aon aoo ay- aya ayc ayh ayk ayn ayo baa bab bac bah bak ban bao bay bba bbb bbc bbh bbk bbn bbo bby bca bcb bcc bch bck bcn bco bcy bha bhb bhc bhh bhk bho bka bkb bkc bkk bkn bko bna bnb bnc bnk bnn bno boa bob boc boh bok bon boo boy by- bya byc byh byk byn byo c-- caa cab cac cah cak can cao cay cba cbb cbc cbh cbk cbn cbo cby cca ccb ccc cch cck ccn cco ch- cha chb chc chh chk chn cho chy cka ckb ckc ckh cko cky cn- cna cnb cnc cnh cnn cno cny co- coa cob coc coh cok con coo coy cya cyb cyc cyk cyn cyo haa hab hac hah hak han hao hay hba hbb hbc hbh hbk hbn hbo hby hca hcb hcc hch hck hcn hco hcy hha hhb hhc hhh hhk hhn hho hhy hka hkb hkh hkk hkn hko hna hnb hnc hnh hnk hnn hno hny hoa hob hoc hoh hok hon hoo hoy hy- hya hyb hyc hyh hyn hyo hyy ka- kaa kab kac kah kak kan kao kay kba kbb kbc kbh kbk kbn kbo kca kcb kcc kch kck kcn kha khh khk khn kho kkb kkc kkh kkk kkn kky kn- kna knc knk knn kno koa kob koc koh kok kon koo koy kya kyc kyn kyo naa nab nac nah nak nan nao nay nba nbb nbc nbk nbn nbo nca ncb ncc nch nck ncn nco nha nhb nhc nhh nhk nhn nhy nka nkc nkk nkn nko nky nna nnb nnc nnh nnk nnn nno no- noa nob noc noh nok non noo noy nya nyc nyk nyn nyo nyy oaa oab oac oah oak oan oao ob- oba obb obc obh obk obn obo oby oc- oca ocb occ och ock ocn oco oha ohc ohh ohn oho oka okb okc okk oko on- ona onb onc onh onk onn ono ony oo- ooa oob ooc ooh ook oon ooo oya oyo yaa yab yac yah yak yan yao yay ybc yby yca ycc ych yco ycy yha yhc yka ykk ykn yna ynk ynn yny yob yoc yok yon yoo yoy yyb yyc yyy