-er a-a a-c a-z aaa aac aae aar aav aaz ac- aca acc ace acr acv acz aea aec aee aer aev aez ar- ara arc are arr arv arz av- ava avc ave avr avz az- aza aze azz c-- caa cac cae car cav caz cca ccc cce ccr ccv ccz ce- cea cec cee cer cev cez cra crc cre crr crv crz cva cvc cve cvr cvv cvz cz- czc cze eaa eac eae ear eav eaz ec- eca ecc ece ecr ecv eea eec eee eer eev era erc ere err erv erz eva evc eve evr evv eze ezr ezz ra- raa rac rae rar rav raz rca rcc rce rcr rcv re- rea rec ree rer rev rez rra rrc rrr rva rvc rve rvr rvv rza rze v-a v-e vaa vac vae var vav vaz vca vcc vce vcr vea vec vee ver vez vra vrc vre vrr vva vvc vvr vvv vvz zaa zac zar zav zaz zce zea zec zee zer zev zez zzr zzz