a-a a-b a-c aaa aab aac aae aah aao aav ab- aba abb abc abe abh abo abv ac- aca acb acc ace ach aco acv aea aeb aec aee aeh aeo aev aha ahb ahc ahe ahh aho ahv aoa aob aoc aoe aoh aoo aov av- ava avb avc ave avh avo baa bab bac bae bah bao bav bba bbb bbc bbe bbh bbo bca bcb bcc bce bch bco bcv be- bea beb bec bee beh beo bev bha bhb bhc bhe bhh bho bhv boa bob boc boe boh boo bov bva bvb bvc bve bvh bvo bvv c-- caa cab cac cae cah cao cav cba cbb cbc cbe cbh cbo cbv cca ccb ccc cce cch cco ccv ce- cea ceb cec cee ceh ceo cev ch- cha chb chc che chh cho chv co- coa cob coc coe coh coo cov cva cvb cvc cve cvh cvo cvv eaa eab eac eae eah eao eav eba ebb ebc ebe ebh ebo ebv ec- eca ecb ecc ece ech eco ecv eea eeb eec eee eeo eev eha ehb ehc ehe ehh eho ehv eo- eoa eob eoc eoe eoh eoo eva evb evc eve evh evo evv haa hab hac hae hah hao hav hba hbb hbc hbe hbh hbo hbv hca hcb hcc hce hch hco hcv he- hea heb hec hee heh heo hev hha hhb hhc hhe hhh hho hhv hoa hob hoc hoe hoh hoo hov hv- hva hvb hvc hvo hvv oaa oab oac oae oah oao oav ob- oba obb obc obe obh obo obv oc- oca ocb occ och oco ocv oea oeb oec oee oeh oeo oha ohc ohe ohh oho oo- ooa oob ooc ooh ooo oov ov- ova ovb ovc ove ovh ovo ovv v-a v-e vaa vab vac vae vah vao vav vba vbc vbh vbo vbv vca vcc vce vch vco vea veb vec vee veh veo vh- vha vhb vhc vhe vho voa vob voc voe voh voo vov vva vvb vvc vvo vvv