-er a-a a-c aaa aac aae aak aan aar aav ac- aca acc ace ack acn acr acv aea aec aee aek aen aer aev aka akc ake akk akn akr akv an- ana anc ane ank ann anr anv ar- ara arc are ark arn arr arv av- ava avc ave avk avn avr c-- caa cac cae cak can car cav cca ccc cce cck ccn ccr ccv ce- cea cec cee cek cen cer cev cka ckc cn- cna cnc cne cnn cnr cnv cra crc cre crk crn crr crv cva cvc cve cvk cvn cvr cvv eaa eac eae eak ean ear eav ec- eca ecc ece eck ecn ecr ecv eea eec eee eek een eer eev eka ekc eke ekr ekv en- ena enc ene enk enn enr env era erc ere erk ern err erv eva evc eve evn evr evv ka- kaa kac kae kak kan kar kav kca kcc kce kck kcn kcr ke- kea kec kee kek ken ker kev kkc kke kkk kkn kkr kkv kn- kna knc kne knk knn knr kra krc krk krn krr krv kva kvk kvn kvr kvv naa nac nae nak nan nar nav nca ncc nce nck ncn ncr ncv ne- nea nec nee nek nen ner nev nka nkc nke nkk nkn nkr nna nnc nne nnk nnn nnv nra nrc nre nrk nrn nrr nrv nva nvc nve nvk nvn nvv ra- raa rac rae rak ran rar rav rca rcc rce rcn rcr rcv re- rea rec ree rek ren rer rev rkc rke rkk rkv rna rnc rnn rnr rnv rra rrc rrk rrn rrr rva rvc rve rvn rvr rvv v-a v-e vaa vac vae vak van var vav vca vcc vce vcn vcr vea vec vee vek ven ver vka vn- vna vnr vnv vra vrc vre vrk vrn vrr vva vvc vvr vvv