-ic a-a a-b a-c a-i aaa aab aac aai aak aao aav ab- aba abb abc abi abk abo abv ac- aca acb acc aci ack aco acv ai- aia aib aic aii aik aio aiv aka akb akc aki akk ako akv aoa aob aoc aoi aok aoo aov av- ava avb avc avi avk avo baa bab bac bai bak bao bav bba bbb bbc bbi bbk bbo bca bcb bcc bci bck bco bcv bi- bia bib bic bii bik bio biv bka bkb bkc bkk bko bkv boa bob boc boi bok boo bov bva bvb bvc bvi bvk bvo bvv c-- caa cab cac cai cak cao cav cba cbb cbc cbi cbk cbo cbv cca ccb ccc cci cck cco ccv ci- cia cib cic cii cik cio civ cka ckb ckc cki cko co- coa cob coc coi cok coo cov cva cvb cvc cvi cvk cvo cvv i-v ia- iaa iab iac iai iao iav iba ibb ibc ibi ibk ibo ibv ica icb icc ici ick ico icv iia iib iic iii iio ika ikb ikc iki ikk iko ikv io- ioa iob ioc ioi ioo iov iva ivb ivc ivi ivo ivv ka- kaa kab kac kai kak kao kav kba kbb kbc kbi kbk kbo kca kcb kcc kci kck kia kib kic kii kik kio kiv kkb kkc kki kkk kkv koa kob koc koi kok koo kva kvb kvi kvk kvo kvv o-i oaa oab oac oai oak oao oav ob- oba obb obc obi obk obo obv oc- oca ocb occ oci ock oco ocv oia oib oic oii oik oio oiv oka okb okc oki okk oko oo- ooa oob ooc ooi ook ooo oov ov- ova ovb ovc ovi ovo ovv v-a vaa vab vac vai vak vao vav vba vbc vbi vbk vbo vbv vca vcc vci vco vi- via vib vic vii vik vio viv vka vkb voa vob voc voi vok voo vov vva vvb vvc vvi vvo vvv