-er a-a a-c aaa aac aae aap aar aav ac- aca acc ace acp acr acv aea aec aee aep aer aev ap- apa apc ape app apr apv ar- ara arc are arp arr arv av- ava avc ave avp avr c-- caa cac cae cap car cav cca ccc cce ccp ccr ccv ce- cea cec cee cep cer cev cpa cpc cpe cpp cpr cpv cra crc cre crp crr crv cva cvc cve cvp cvr cvv eaa eac eae eap ear eav ec- eca ecc ece ecr ecv eea eec eee eep eer eev ep- epa epc epe epp epr era erc ere erp err erv eva evc eve evp evr evv p-p paa pac pae pap par pav pca pcc pce pcp pcr pcv pea pec pee pep per pev ppa ppc ppe ppp ppr ppv pra prc pre prp prr prv pva pvc pve pvp pvr pvv ra- raa rac rae rap rar rav rca rcc rce rcp rcr rcv re- rea rec ree rep rer rev rpa rpc rpe rpp rpr rpv rra rrc rrp rrr rva rvc rve rvp rvr rvv v-a v-e vaa vac vae vap var vav vca vcc vce vcp vcr vea vec vee vep ver vpa vpc vpe vpp vpr vra vrc vre vrp vrr vva vvc vvr vvv