a-a a-b a-c aaa aab aac aag aah aao aav aay ab- aba abb abc abg abh abo abv aby ac- aca acb acc acg ach aco acv acy ag- aga agb agc agg agh ago agv agy aha ahb ahc ahg ahh aho ahv ahy aoa aob aoc aog aoh aoo aov av- ava avb avc avg avh avo avy ay- aya ayc ayh ayo baa bab bac bag bah bao bav bay bba bbb bbc bbg bbh bbo bby bca bcb bcc bcg bch bco bcv bcy bga bgb bgc bgg bgh bgo bgv bha bhb bhc bhg bhh bho bhv boa bob boc bog boh boo bov boy bva bvb bvc bvg bvh bvo bvv by- bya byc byg byh byo c-- caa cab cac cag cah cao cav cay cba cbb cbc cbg cbh cbo cbv cby cca ccb ccc ccg cch cco ccv cga cgb cgc cgg cgh cgo cgv cgy ch- cha chb chc chg chh cho chv chy co- coa cob coc cog coh coo cov coy cva cvb cvc cvg cvh cvo cvv cya cyb cyc cyg cyo gaa gab gac gag gah gao gav gay gba gbc gbg gbh gbo gbv gby gca gcb gcc gcg gch gco gga ggb ggc ggg ggh ggo ggv gha ghb ghc ghg ghh gho goa gob goc gog goh goo gov goy gva gvb gvc gvg gvh gvo gy- gya gyb gyo haa hab hac hag hah hao hav hay hba hbb hbc hbg hbh hbo hbv hby hca hcb hcc hcg hch hco hcv hcy hga hgb hgc hgg hgh hgo hgv hgy hha hhb hhc hhg hhh hho hhv hhy hoa hob hoc hog hoh hoo hov hoy hv- hva hvb hvc hvg hvo hvv hvy hy- hya hyb hyc hyg hyh hyo hyv hyy oaa oab oac oag oah oao oav ob- oba obb obc obg obh obo obv oby oc- oca ocb occ ocg och oco ocv oga ogc ogg ogh ogo ogy oha ohc ohg ohh oho oo- ooa oob ooc oog ooh ooo oov ov- ova ovb ovc ovh ovo ovv oya oyo v-a vaa vab vac vag vah vao vav vay vba vbc vbg vbh vbo vbv vca vcc vch vco vcy vga vgc vgg vgh vgo vh- vha vhb vhc vho voa vob voc vog voh voo vov voy vva vvb vvc vvg vvo vvv vyg yaa yab yac yag yah yao yav yay ybc ybg yby yca ycc ych yco ycv ycy yga ygc ygo yha yhc yob yoc yog yoo yoy yva yvo yvy yyb yyc yyg yyy