-er a-a a-c a-t aaa aac aae aao aar aat aav aax ac- aca acc ace aco acr act acv acx aea aec aee aeo aer aet aev aex aoa aoc aoe aoo aor aot aov aox ar- ara arc are aro arr art arv arx at- ata atc ate ato atr att atv atx av- ava avc ave avo avr avt avx ax- axa axe axo axr axt axv axx c-- caa cac cae cao car cat cav cax cca ccc cce cco ccr cct ccv ccx ce- cea cec cee ceo cer cet cev cex co- coa coc coe coo cor cot cov cox cra crc cre cro crr crt crv crx cta ctc cte cto ctr ctt ctv ctx cva cvc cve cvo cvr cvt cvv cvx cxc cxo cxr cxt cxv cxx eaa eac eae eao ear eat eav eax ec- eca ecc ece eco ecr ect ecv ecx eea eec eee eeo eer eet eev eex eo- eoa eoc eoe eoo eor eot era erc ere ero err ert erv eta etc ete eto etr ett etv etx eva evc eve evo evr evt evv ex- exa exc exe exo exr ext exx oaa oac oae oao oar oat oav oax oc- oca occ oco ocr oct ocv ocx oea oec oee oeo oer oet oex oo- ooa ooc ooo oor oot oov oox or- ora orc ore oro orr ort orv orx ot- ota otc ote oto otr ott otv ov- ova ovc ove ovo ovv ox- oxa oxc oxo oxt oxx ra- raa rac rae rao rar rat rav rax rca rcc rce rco rcr rct rcv rcx re- rea rec ree reo rer ret rev rex roa roc roe roo ror rot rov rox rra rrc rrr rrt rta rtc rte rto rtr rtt rtv rtx rva rvc rve rvo rvr rvt rvv rxr t-x taa tac tae tao tar tat tav tax tca tcc tce tco tcr tct tcv tcx te- tea tec tee teo ter tet tev tex to- toa toc toe too tor tot tov tox tra trc tre tro trr trt trv trx tta ttc tte tto ttr ttt ttv ttx tva tvc tve tvo tvr tvt tvx txe txt v-a v-e vaa vac vae vao var vat vav vax vca vcc vce vco vcr vct vcx vea vec vee veo ver vet vex voa voc voe voo vor vot vov vox vra vrc vre vrr vrt vta vtc vte vto vtr vtt vtv vtx vva vvc vvo vvr vvt vvv vxa vxr vxv xaa xac xar xat xav xcr xcv xcx xee xer xet xev xex xoa xoc xoo xor xot xov xox xrc xrt xrx xtc xtr xtv xtx xvt xxo xxv xxx