a-a a-b a-c aaa aab aac aah aao aar aav ab- aba abb abc abh abo abr abv ac- aca acb acc ach aco acr acv aha ahb ahc ahh aho ahr ahv aoa aob aoc aoh aoo aor aov ar- ara arb arc arh aro arr arv av- ava avb avc avh avo avr baa bab bac bah bao bar bav bba bbb bbc bbh bbo bbr bca bcb bcc bch bco bcr bcv bha bhb bhc bhh bho bhr bhv boa bob boc boh boo bor bov bra brb brh bro brr brv bva bvb bvc bvh bvo bvr bvv c-- caa cab cac cah cao car cav cba cbb cbc cbh cbo cbr cbv cca ccb ccc cch cco ccr ccv ch- cha chb chc chh cho chr chv co- coa cob coc coh coo cor cov cra crb crc crh cro crr crv cva cvb cvc cvh cvo cvr cvv haa hab hac hah hao har hav hba hbb hbc hbh hbo hbr hbv hca hcb hcc hch hco hcr hcv hha hhb hhc hhh hho hhr hhv hoa hob hoc hoh hoo hor hov hr- hra hrb hrc hrh hro hrr hrv hv- hva hvb hvc hvo hvr hvv oaa oab oac oah oao oar oav ob- oba obb obc obh obo obr obv oc- oca ocb occ och oco ocr ocv oha ohc ohh oho ohr oo- ooa oob ooc ooh ooo oor oov or- ora orb orc orh oro orr orv ov- ova ovb ovc ovh ovo ovv ra- raa rab rac rah rao rar rav rba rbb rbc rbh rbo rbr rca rcb rcc rch rco rcr rcv rh- rha rhb rhc rhh rho rhr rhv roa rob roc roh roo ror rov rra rrb rrc rrh rrr rva rvb rvc rvh rvo rvr rvv v-a vaa vab vac vah vao var vav vba vbc vbh vbo vbr vbv vca vcc vch vco vcr vh- vha vhb vhc vho voa vob voc voh voo vor vov vra vrb vrc vrh vrr vva vvb vvc vvo vvr vvv