-ic a-a a-b a-c a-i aaa aab aac aag aai aak aao aav ab- aba abb abc abg abi abk abo abv ac- aca acb acc acg aci ack aco acv ag- aga agb agc agg agi agk ago agv ai- aia aib aic aig aii aik aio aiv aka akb akc akg aki akk ako akv aoa aob aoc aog aoi aok aoo aov av- ava avb avc avg avi avk avo baa bab bac bag bai bak bao bav bba bbb bbc bbg bbi bbk bbo bca bcb bcc bcg bci bck bco bcv bga bgb bgc bgg bgi bgk bgo bgv bi- bia bib bic big bii bik bio biv bka bkb bkc bkg bkk bko bkv boa bob boc bog boi bok boo bov bva bvb bvc bvg bvi bvk bvo bvv c-- caa cab cac cag cai cak cao cav cba cbb cbc cbg cbi cbk cbo cbv cca ccb ccc ccg cci cck cco ccv cga cgb cgc cgg cgi cgo cgv ci- cia cib cic cig cii cik cio civ cka ckb ckc cki cko co- coa cob coc cog coi cok coo cov cva cvb cvc cvg cvi cvk cvo cvv gaa gab gac gag gai gak gao gav gba gbc gbg gbi gbk gbo gbv gca gcb gcc gcg gci gck gco gga ggb ggc ggg ggi ggo ggv gia gib gic gig gii gik gio giv gka gkb gko goa gob goc gog goi gok goo gov gva gvb gvc gvg gvi gvk gvo i-v ia- iaa iab iac iag iai iao iav iba ibb ibc ibg ibi ibk ibo ibv ica icb icc icg ici ick ico icv iga igb igc igg igi igk igo iia iib iic iii iio ika ikb ikc iki ikk iko ikv io- ioa iob ioc iog ioi ioo iov iva ivb ivc ivg ivi ivo ivv ka- kaa kab kac kag kai kak kao kav kba kbb kbc kbi kbk kbo kca kcb kcc kcg kci kck kga kgb kgc kgi kgo kgv kia kib kic kig kii kik kio kiv kkb kkc kki kkk kkv koa kob koc kog koi kok koo kva kvb kvi kvk kvo kvv o-i oaa oab oac oag oai oak oao oav ob- oba obb obc obg obi obk obo obv oc- oca ocb occ ocg oci ock oco ocv oga ogc ogg ogi ogo oia oib oic oii oik oio oiv oka okb okc okg oki okk oko oo- ooa oob ooc oog ooi ook ooo oov ov- ova ovb ovc ovi ovo ovv v-a vaa vab vac vag vai vak vao vav vba vbc vbg vbi vbk vbo vbv vca vcc vci vco vga vgc vgg vgo vi- via vib vic vig vii vik vio viv vka vkb vkg voa vob voc vog voi vok voo vov vva vvb vvc vvg vvi vvo vvv