-er a-a a-c aaa aac aad aae aak aar aav ac- aca acc acd ace ack acr acv ad- ada adc add ade adk adr adv aea aec aed aee aek aer aev aka akc akd ake akk akr akv ar- ara arc ard are ark arr arv av- ava avc avd ave avk avr c-- caa cac cad cae cak car cav cca ccc ccd cce cck ccr ccv cda cdc cdd cde cdk cdr cdv ce- cea cec ced cee cek cer cev cka ckc ckd cra crc crd cre crk crr crv cva cvc cvd cve cvk cvr cvv daa dac dad dae dak dar dav dca dcc dcd dce dck dcr dcv dda ddc ddd dde ddk ddr de- dea dec ded dee dek der dev dka dkc dke dkk dkr dra drc drd dre drk drr drv dva dvc dvd dve dvk dvr eaa eac ead eae eak ear eav ec- eca ecc ecd ece eck ecr ecv ed- eda edc edd ede edk edr eea eec eed eee eek eer eev eka ekc ekd eke ekr ekv era erc erd ere erk err erv eva evc evd eve evr evv ka- kaa kac kad kae kak kar kav kca kcc kcd kce kck kcr kda kdc kde kdk kdr ke- kea kec ked kee kek ker kev kkc kke kkk kkr kkv kra krc krd krk krr krv kva kvk kvr kvv ra- raa rac rad rae rak rar rav rca rcc rcd rce rcr rcv rda rdc rdd rde rdr rdv re- rea rec red ree rek rer rev rkc rke rkk rkv rra rrc rrd rrk rrr rva rvc rvd rve rvr rvv v-a v-e vaa vac vad vae vak var vav vca vcc vcd vce vcr vdc vdd vde vdk vdr vdv vea vec ved vee vek ver vka vra vrc vrd vre vrk vrr vva vvc vvr vvv