-er a-a a-c aaa aac aae aan aar aav aax ac- aca acc ace acn acr acv acx aea aec aee aen aer aev aex an- ana anc ane ann anr anv anx ar- ara arc are arn arr arv arx av- ava avc ave avn avr avx ax- axa axe axn axr axv axx c-- caa cac cae can car cav cax cca ccc cce ccn ccr ccv ccx ce- cea cec cee cen cer cev cex cn- cna cnc cne cnn cnr cnv cnx cra crc cre crn crr crv crx cva cvc cve cvn cvr cvv cvx cxc cxr cxv cxx eaa eac eae ean ear eav eax ec- eca ecc ece ecn ecr ecv ecx eea eec eee een eer eev eex en- ena enc ene enn enr env era erc ere ern err erv eva evc eve evn evr evv ex- exa exc exe exr exx naa nac nae nan nar nav nax nca ncc nce ncn ncr ncv ncx ne- nea nec nee nen ner nev nex nna nnc nne nnn nnv nra nrc nre nrn nrr nrv nrx nva nvc nve nvn nvv nxc nxv ra- raa rac rae ran rar rav rax rca rcc rce rcn rcr rcv rcx re- rea rec ree ren rer rev rex rna rnc rnn rnr rnv rra rrc rrn rrr rva rvc rve rvn rvr rvv rxr v-a v-e vaa vac vae van var vav vax vca vcc vce vcn vcr vcx vea vec vee ven ver vex vn- vna vnr vnv vra vrc vre vrn vrr vva vvc vvr vvv vxa vxr vxv xaa xac xan xar xav xcr xcv xcx xee xen xer xev xex xna xnc xrc xrx xxv xxx