-er a-a a-c aaa aac aae aag aap aar aav ac- aca acc ace acg acp acr acv aea aec aee aeg aep aer aev ag- aga agc age agg agp agr agv ap- apa apc ape apg app apr apv ar- ara arc are arg arp arr arv av- ava avc ave avg avp avr c-- caa cac cae cag cap car cav cca ccc cce ccg ccp ccr ccv ce- cea cec cee ceg cep cer cev cga cgc cge cgg cgp cgr cgv cpa cpc cpe cpg cpp cpr cpv cra crc cre crg crp crr crv cva cvc cve cvg cvp cvr cvv eaa eac eae eag eap ear eav ec- eca ecc ece ecg ecr ecv eea eec eee eeg eep eer eev ega egc ege egg egp egr ep- epa epc epe epg epp epr era erc ere erg erp err erv eva evc eve evg evp evr evv g-p gaa gac gae gag gap gar gav gca gcc gce gcg gcp gcr ge- gea gec gee geg gep ger gev gga ggc ggg ggp ggr ggv gpa gpc gpe gpg gpp gpr gra grc gre grg grp grr grv gva gvc gve gvg gvp gvr p-p paa pac pae pag pap par pav pca pcc pce pcg pcp pcr pcv pea pec pee peg pep per pev pga pgc pge pgg pgp pgr pgv ppa ppc ppe ppg ppp ppr ppv pra prc pre prg prp prr prv pva pvc pve pvg pvp pvr pvv ra- raa rac rae rag rap rar rav rca rcc rce rcg rcp rcr rcv re- rea rec ree reg rep rer rev rga rgc rge rgg rgp rgr rgv rpa rpc rpe rpg rpp rpr rpv rra rrc rrg rrp rrr rva rvc rve rvg rvp rvr rvv v-a v-e vaa vac vae vag vap var vav vca vcc vce vcp vcr vea vec vee veg vep ver vga vgc vgg vgp vgr vpa vpc vpe vpg vpp vpr vra vrc vre vrg vrp vrr vva vvc vvg vvr vvv