-ic a-a a-b a-c a-i aaa aab aac aai aak aao aar aav ab- aba abb abc abi abk abo abr abv ac- aca acb acc aci ack aco acr acv ai- aia aib aic aii aik aio air aiv aka akb akc aki akk ako akr akv aoa aob aoc aoi aok aoo aor aov ar- ara arb arc ari ark aro arr arv av- ava avb avc avi avk avo avr baa bab bac bai bak bao bar bav bba bbb bbc bbi bbk bbo bbr bca bcb bcc bci bck bco bcr bcv bi- bia bib bic bii bik bio bir biv bka bkb bkc bkk bko bkr bkv boa bob boc boi bok boo bor bov bra brb bri brk bro brr brv bva bvb bvc bvi bvk bvo bvr bvv c-- caa cab cac cai cak cao car cav cba cbb cbc cbi cbk cbo cbr cbv cca ccb ccc cci cck cco ccr ccv ci- cia cib cic cii cik cio cir civ cka ckb ckc cki cko co- coa cob coc coi cok coo cor cov cra crb crc cri crk cro crr crv cva cvb cvc cvi cvk cvo cvr cvv i-v ia- iaa iab iac iai iao iar iav iba ibb ibc ibi ibk ibo ibr ibv ica icb icc ici ick ico icr icv iia iib iic iii iio iir ika ikb ikc iki ikk iko ikr ikv io- ioa iob ioc ioi ioo ior iov ir- ira irb irc iri irk iro irr irv iva ivb ivc ivi ivo ivr ivv ka- kaa kab kac kai kak kao kar kav kba kbb kbc kbi kbk kbo kbr kca kcb kcc kci kck kcr kia kib kic kii kik kio kir kiv kkb kkc kki kkk kkr kkv koa kob koc koi kok koo kor kra krc kri krk kro krr krv kva kvb kvi kvk kvo kvr kvv o-i oaa oab oac oai oak oao oar oav ob- oba obb obc obi obk obo obr obv oc- oca ocb occ oci ock oco ocr ocv oia oib oic oii oik oio oir oiv oka okb okc oki okk oko okr oo- ooa oob ooc ooi ook ooo oor oov or- ora orb orc ori ork oro orr orv ov- ova ovb ovc ovi ovo ovv ra- raa rab rac rai rak rao rar rav rba rbb rbc rbi rbk rbo rbr rca rcb rcc rci rco rcr rcv ria rib ric rii rik rio rir riv rkb rkc rkk rko rkv roa rob roc roi rok roo ror rov rra rrb rrc rri rrk rrr rva rvb rvc rvi rvo rvr rvv v-a vaa vab vac vai vak vao var vav vba vbc vbi vbk vbo vbr vbv vca vcc vci vco vcr vi- via vib vic vii vik vio vir viv vka vkb voa vob voc voi vok voo vor vov vra vrb vrc vri vrk vrr vva vvb vvc vvi vvo vvr vvv