a-a a-b a-c aaa aab aac aah aao aar aau aav ab- aba abb abc abh abo abr abu abv ac- aca acb acc ach aco acr acu acv aha ahb ahc ahh aho ahr ahu ahv aoa aob aoc aoh aoo aor aou aov ar- ara arb arc arh aro arr aru arv au- aua aub auc auh auo aur auv av- ava avb avc avh avo avr avu b-u baa bab bac bah bao bar bau bav bba bbb bbc bbh bbo bbr bbu bca bcb bcc bch bco bcr bcu bcv bha bhb bhc bhh bho bhr bhu bhv boa bob boc boh boo bor bou bov bra brb brh bro brr bru brv bua bub buc buh buo bur buu bva bvb bvc bvh bvo bvr bvu bvv c-- caa cab cac cah cao car cau cav cba cbb cbc cbh cbo cbr cbu cbv cca ccb ccc cch cco ccr ccu ccv ch- cha chb chc chh cho chr chu chv co- coa cob coc coh coo cor cou cov cra crb crc crh cro crr cru crv cua cub cuc cuh cuo cur cuu cuv cva cvb cvc cvh cvo cvr cvu cvv haa hab hac hah hao har hau hav hba hbb hbc hbh hbo hbr hbu hbv hca hcb hcc hch hco hcr hcv hha hhb hhc hhh hho hhr hhu hhv hoa hob hoc hoh hoo hor hou hov hr- hra hrb hrc hrh hro hrr hru hrv hua hub huc huh huo hur huu huv hv- hva hvb hvc hvo hvr hvv oaa oab oac oah oao oar oau oav ob- oba obb obc obh obo obr obu obv oc- oca ocb occ och oco ocr ocu ocv oha ohc ohh oho ohr ohu oo- ooa oob ooc ooh ooo oor oov or- ora orb orc orh oro orr oru orv ou- oua ouc ouh ouo our ov- ova ovb ovc ovh ovo ovv ra- raa rab rac rah rao rar rau rav rba rbb rbc rbh rbo rbr rbu rca rcb rcc rch rco rcr rcu rcv rh- rha rhb rhc rhh rho rhr rhu rhv roa rob roc roh roo ror rou rov rra rrb rrc rrh rrr rru rua rub ruc ruh ruo rur ruu ruv rva rvb rvc rvh rvo rvr rvu rvv ua- uaa uab uac uah uao uar uau uav uba ubb ubc ubh ubo ubr ubu ubv uca ucb ucc uch uco ucr ucu ucv uha uhb uhc uhh uho uhr uhu uhv uoa uob uoc uoo uor ur- ura urb urc uro urr uru uua uuc uur uuu uva uvb uvc uvo uvu uvv v-a vaa vab vac vah vao var vau vav vba vbc vbh vbo vbr vbv vca vcc vch vco vcr vcu vh- vha vhb vhc vho voa vob voc voh voo vor vou vov vra vrb vrc vrh vrr vru vur vuv vva vvb vvc vvo vvr vvv