-ic a-a a-b a-c a-i aaa aab aac aae aai aak aao aav ab- aba abb abc abe abi abk abo abv ac- aca acb acc ace aci ack aco acv aea aeb aec aee aei aek aeo aev ai- aia aib aic aie aii aik aio aiv aka akb akc ake aki akk ako akv aoa aob aoc aoe aoi aok aoo aov av- ava avb avc ave avi avk avo baa bab bac bae bai bak bao bav bba bbb bbc bbe bbi bbk bbo bca bcb bcc bce bci bck bco bcv be- bea beb bec bee bei bek beo bev bi- bia bib bic bie bii bik bio biv bka bkb bkc bke bkk bko bkv boa bob boc boe boi bok boo bov bva bvb bvc bve bvi bvk bvo bvv c-- caa cab cac cae cai cak cao cav cba cbb cbc cbe cbi cbk cbo cbv cca ccb ccc cce cci cck cco ccv ce- cea ceb cec cee cei cek ceo cev ci- cia cib cic cie cii cik cio civ cka ckb ckc cki cko co- coa cob coc coe coi cok coo cov cva cvb cvc cve cvi cvk cvo cvv eaa eab eac eae eai eak eao eav eba ebb ebc ebe ebi ebk ebo ebv ec- eca ecb ecc ece eci eck eco ecv eea eeb eec eee eek eeo eev eia eib eic eie eii eik eio eiv eka ekb ekc eke eki eko ekv eo- eoa eob eoc eoe eoi eok eoo eva evb evc eve evi evo evv i-v ia- iaa iab iac iae iai iao iav iba ibb ibc ibe ibi ibk ibo ibv ica icb icc ice ici ick ico icv ie- iea iec iee iei iek iev iia iib iic iie iii iio ika ikb ikc ike iki ikk iko ikv io- ioa iob ioc ioe ioi ioo iov iva ivb ivc ive ivi ivo ivv ka- kaa kab kac kae kai kak kao kav kba kbb kbc kbe kbi kbk kbo kca kcb kcc kce kci kck ke- kea keb kec kee kei kek keo kev kia kib kic kie kii kik kio kiv kkb kkc kke kki kkk kkv koa kob koc koe koi kok koo kva kvb kvi kvk kvo kvv o-i oaa oab oac oae oai oak oao oav ob- oba obb obc obe obi obk obo obv oc- oca ocb occ oci ock oco ocv oea oeb oec oee oei oeo oia oib oic oie oii oik oio oiv oka okb okc oke oki okk oko oo- ooa oob ooc ooi ook ooo oov ov- ova ovb ovc ove ovi ovo ovv v-a v-e vaa vab vac vae vai vak vao vav vba vbc vbi vbk vbo vbv vca vcc vce vci vco vea veb vec vee vei vek veo vi- via vib vic vie vii vik vio viv vka vkb voa vob voc voe voi vok voo vov vva vvb vvc vvi vvo vvv