a-a a-b a-c aaa aab aac aah aan aao aar aay ab- aba abb abc abh abn abo abr aby ac- aca acb acc ach acn aco acr acy aha ahb ahc ahh ahn aho ahr ahy an- ana anb anc anh ann ano anr any aoa aob aoc aoh aon aoo aor ar- ara arb arc arh arn aro arr ary ay- aya ayc ayh ayn ayo ayr baa bab bac bah ban bao bar bay bba bbb bbc bbh bbn bbo bbr bby bca bcb bcc bch bcn bco bcr bcy bha bhb bhc bhh bho bhr bna bnb bnc bnn bno bnr boa bob boc boh bon boo bor boy bra brb brh brn bro brr bry by- bya byc byh byn byo byr c-- caa cab cac cah can cao car cay cba cbb cbc cbh cbn cbo cbr cby cca ccb ccc cch ccn cco ccr ch- cha chb chc chh chn cho chr chy cn- cna cnb cnc cnh cnn cno cnr cny co- coa cob coc coh con coo cor coy cra crb crc crh crn cro crr cry cya cyb cyc cyn cyo cyr haa hab hac hah han hao har hay hba hbb hbc hbh hbn hbo hbr hby hca hcb hcc hch hcn hco hcr hcy hha hhb hhc hhh hhn hho hhr hhy hna hnb hnc hnh hnn hno hny hoa hob hoc hoh hon hoo hor hoy hr- hra hrb hrc hrh hrn hro hrr hy- hya hyb hyc hyh hyn hyo hyr hyy naa nab nac nah nan nao nar nay nba nbb nbc nbn nbo nbr nca ncb ncc nch ncn nco ncr nha nhb nhc nhh nhn nhr nhy nna nnb nnc nnh nnn nno no- noa nob noc noh non noo nor noy nra nrb nrc nrn nro nrr nry nya nyc nyn nyo nyy oaa oab oac oah oan oao oar ob- oba obb obc obh obn obo obr oby oc- oca ocb occ och ocn oco ocr oha ohc ohh ohn oho ohr on- ona onb onc onh onn ono onr ony oo- ooa oob ooc ooh oon ooo oor or- ora orb orc orh orn oro orr ory oya oyo ra- raa rab rac rah ran rao rar ray rba rbb rbc rbh rbn rbo rbr rca rcb rcc rch rcn rco rcr rh- rha rhb rhc rhh rhn rho rhr rna rnb rnc rnh rnn rno rnr rny roa rob roc roh ron roo ror roy rra rrb rrc rrh rrn rrr ry- rya ryc ryn ryo ryr ryy yaa yab yac yah yan yao yar yay ybc ybr yby yca ycc ych yco ycy yha yhc yna ynn yny yob yoc yon yoo yor yoy yra yrc yrn yro yyb yyc yyy