-er a-a a-c aaa aac aae aap aar aas aav ac- aca acc ace acp acr acs acv aea aec aee aep aer aes aev ap- apa apc ape app apr aps apv ar- ara arc are arp arr ars arv as- asa asc ase asp asr ass asv av- ava avc ave avp avr avs c-- caa cac cae cap car cas cav cca ccc cce ccp ccr ccs ccv ce- cea cec cee cep cer ces cev cpa cpc cpe cpp cpr cps cpv cra crc cre crp crr crs crv csa csc cse csp csr css csv cva cvc cve cvp cvr cvs cvv eaa eac eae eap ear eas eav ec- eca ecc ece ecr ecs ecv eea eec eee eep eer ees eev ep- epa epc epe epp epr eps era erc ere erp err ers erv es- esa esc ese esp esr ess esv eva evc eve evp evr evs evv p-p paa pac pae pap par pas pav pca pcc pce pcp pcr pcs pcv pea pec pee pep per pes pev ppa ppc ppe ppp ppr pps ppv pra prc pre prp prr prs prv ps- psa psc pse psp psr pss psv pva pvc pve pvp pvr pvs pvv ra- raa rac rae rap rar ras rav rca rcc rce rcp rcr rcs rcv re- rea rec ree rep rer res rev rpa rpc rpe rpp rpr rps rpv rra rrc rrp rrr rrs rsa rsc rse rsp rsr rss rsv rva rvc rve rvp rvr rvs rvv saa sac sae sap sar sas sav sca scc sce scp scr scs scv se- sea sec see sep ser ses sev spa spc spe spp spr sps spv sr- sra src sre srp srr srs srv ss- ssa ssc sse ssp ssr sss ssv sva svc sve svp svr svs svv v-a v-e vaa vac vae vap var vas vav vca vcc vce vcp vcr vcs vea vec vee vep ver ves vpa vpc vpe vpp vpr vps vra vrc vre vrp vrr vrs vsa vsc vse vsp vsr vss vsv vva vvc vvr vvs vvv