-er a-a a-c aaa aac aae aan aar aav ac- aca acc ace acn acr acv aea aec aee aen aer aev an- ana anc ane ann anr anv ar- ara arc are arn arr arv av- ava avc ave avn avr c-- caa cac cae can car cav cca ccc cce ccn ccr ccv ce- cea cec cee cen cer cev cn- cna cnc cne cnn cnr cnv cra crc cre crn crr crv cva cvc cve cvn cvr cvv eaa eac eae ean ear eav ec- eca ecc ece ecn ecr ecv eea eec eee een eer eev en- ena enc ene enn enr env era erc ere ern err erv eva evc eve evn evr evv naa nac nae nan nar nav nca ncc nce ncn ncr ncv ne- nea nec nee nen ner nev nna nnc nne nnn nnv nra nrc nre nrn nrr nrv nva nvc nve nvn nvv ra- raa rac rae ran rar rav rca rcc rce rcn rcr rcv re- rea rec ree ren rer rev rna rnc rnn rnr rnv rra rrc rrn rrr rva rvc rve rvn rvr rvv v-a v-e vaa vac vae van var vav vca vcc vce vcn vcr vea vec vee ven ver vn- vna vnr vnv vra vrc vre vrn vrr vva vvc vvr vvv