a-a a-b a-c aaa aab aac aah aan aao aar aau ab- aba abb abc abh abn abo abr abu ac- aca acb acc ach acn aco acr acu aha ahb ahc ahh ahn aho ahr ahu an- ana anb anc anh ann ano anr anu aoa aob aoc aoh aon aoo aor aou ar- ara arb arc arh arn aro arr aru au- aua aub auc auh aun auo aur b-u baa bab bac bah ban bao bar bau bba bbb bbc bbh bbn bbo bbr bbu bca bcb bcc bch bcn bco bcr bcu bha bhb bhc bhh bho bhr bhu bna bnb bnc bnn bno bnr bnu boa bob boc boh bon boo bor bou bra brb brh brn bro brr bru bua bub buc buh bun buo bur buu c-- caa cab cac cah can cao car cau cba cbb cbc cbh cbn cbo cbr cbu cca ccb ccc cch ccn cco ccr ccu ch- cha chb chc chh chn cho chr chu cn- cna cnb cnc cnh cnn cno cnr cnu co- coa cob coc coh con coo cor cou cra crb crc crh crn cro crr cru cua cub cuc cuh cun cuo cur cuu haa hab hac hah han hao har hau hba hbb hbc hbh hbn hbo hbr hbu hca hcb hcc hch hcn hco hcr hha hhb hhc hhh hhn hho hhr hhu hna hnb hnc hnh hnn hno hnu hoa hob hoc hoh hon hoo hor hou hr- hra hrb hrc hrh hrn hro hrr hru hua hub huc huh hun huo hur huu naa nab nac nah nan nao nar nau nba nbb nbc nbn nbo nbr nbu nca ncb ncc nch ncn nco ncr ncu nha nhb nhc nhh nhn nhr nhu nna nnb nnc nnh nnn nno nnu no- noa nob noc noh non noo nor nou nra nrb nrc nrn nro nrr nru nua nub nuc nuh nun nuo nur nuu oaa oab oac oah oan oao oar oau ob- oba obb obc obh obn obo obr obu oc- oca ocb occ och ocn oco ocr ocu oha ohc ohh ohn oho ohr ohu on- ona onb onc onh onn ono onr onu oo- ooa oob ooc ooh oon ooo oor or- ora orb orc orh orn oro orr oru ou- oua ouc ouh oun ouo our ra- raa rab rac rah ran rao rar rau rba rbb rbc rbh rbn rbo rbr rbu rca rcb rcc rch rcn rco rcr rcu rh- rha rhb rhc rhh rhn rho rhr rhu rna rnb rnc rnh rnn rno rnr rnu roa rob roc roh ron roo ror rou rra rrb rrc rrh rrn rrr rru rua rub ruc ruh run ruo rur ruu ua- uaa uab uac uah uan uao uar uau uba ubb ubc ubh ubn ubo ubr ubu uca ucb ucc uch ucn uco ucr ucu uha uhb uhc uhh uho uhr uhu un- una unb unc unh unn uno unr unu uoa uob uoc uon uoo uor ur- ura urb urc urn uro urr uru uua uuc uun uur uuu