-ic a-a a-b a-c a-i a-t aaa aab aac aai aak aao aat aav ab- aba abb abc abi abk abo abt abv ac- aca acb acc aci ack aco act acv ai- aia aib aic aii aik aio ait aiv aka akb akc aki akk ako akv aoa aob aoc aoi aok aoo aot aov at- ata atb atc ati ato att atv av- ava avb avc avi avk avo avt baa bab bac bai bak bao bat bav bba bbb bbc bbi bbk bbo bbt bca bcb bcc bci bck bco bct bcv bi- bia bib bic bii bik bio bit biv bka bkb bkc bkk bko bkt bkv boa bob boc boi bok boo bot bov bta btb btc bti btk bto btt btv bva bvb bvc bvi bvk bvo bvt bvv c-- caa cab cac cai cak cao cat cav cba cbb cbc cbi cbk cbo cbt cbv cca ccb ccc cci cck cco cct ccv ci- cia cib cic cii cik cio cit civ cka ckb ckc cki cko ckt co- coa cob coc coi cok coo cot cov cta ctb ctc cti ctk cto ctt ctv cva cvb cvc cvi cvk cvo cvt cvv i-v ia- iaa iab iac iai iao iat iav iba ibb ibc ibi ibk ibo ibt ibv ica icb icc ici ick ico ict icv iia iib iic iii iio iit ika ikb ikc iki ikk iko ikt ikv io- ioa iob ioc ioi ioo iot iov ita itb itc iti itk ito itt itv iva ivb ivc ivi ivo ivt ivv k-t ka- kaa kab kac kai kak kao kat kav kba kbb kbc kbi kbk kbo kca kcb kcc kci kck kct kia kib kic kii kik kio kit kiv kkb kkc kki kkk kkt kkv koa kob koc koi kok koo kot kta ktb ktc ktk kto ktt ktv kva kvb kvi kvk kvo kvv o-i oaa oab oac oai oak oao oat oav ob- oba obb obc obi obk obo obt obv oc- oca ocb occ oci ock oco oct ocv oia oib oic oii oik oio oit oiv oka okb okc oki okk oko oo- ooa oob ooc ooi ook ooo oot oov ot- ota otb otc oti otk oto ott otv ov- ova ovb ovc ovi ovo ovv taa tab tac tai tak tao tat tav tba tbb tbc tbi tbk tbo tbt tbv tca tcb tcc tci tck tco tct tcv tia tib tic tii tik tio tit tiv tka tkb tkc tkk tko tkt to- toa tob toc toi tok too tot tov tta ttb ttc tti ttk tto ttt ttv tva tvb tvc tvi tvk tvo tvt v-a vaa vab vac vai vak vao vat vav vba vbc vbi vbk vbo vbv vca vcc vci vco vct vi- via vib vic vii vik vio vit viv vka vkb vkt voa vob voc voi vok voo vot vov vta vtb vtc vti vtk vto vtt vtv vva vvb vvc vvi vvo vvt vvv