-er a-a a-c aaa aac aae aar aau aav ac- aca acc ace acr acu acv aea aec aee aer aeu aev ar- ara arc are arr aru arv au- aua auc aue aur auv av- ava avc ave avr avu c-- caa cac cae car cau cav cca ccc cce ccr ccu ccv ce- cea cec cee cer ceu cev cra crc cre crr cru crv cua cuc cue cur cuu cuv cva cvc cve cvr cvu cvv eaa eac eae ear eau eav ec- eca ecc ece ecr ecu ecv eea eec eee eer eev era erc ere err eru erv eu- eua euc eue eur euv eva evc eve evr evv ra- raa rac rae rar rau rav rca rcc rce rcr rcu rcv re- rea rec ree rer reu rev rra rrc rrr rru rua ruc rue rur ruu ruv rva rvc rve rvr rvu rvv ua- uaa uac uae uar uau uav uca ucc uce ucr ucu ucv uea uec uee uer ur- ura urc ure urr uru uua uuc uue uur uuu uva uvc uve uvu uvv v-a v-e vaa vac vae var vau vav vca vcc vce vcr vcu vea vec vee ver veu vra vrc vre vrr vru vue vur vuv vva vvc vvr vvv