-er a-a a-c aaa aac aae aag aak aao aap aar aav ac- aca acc ace acg ack aco acp acr acv aea aec aee aeg aek aeo aep aer aev ag- aga agc age agg agk ago agp agr agv aka akc ake akg akk ako akp akr akv aoa aoc aoe aog aok aoo aop aor aov ap- apa apc ape apg apk apo app apr apv ar- ara arc are arg ark aro arp arr arv av- ava avc ave avg avk avo avp avr c-- caa cac cae cag cak cao cap car cav cca ccc cce ccg cck cco ccp ccr ccv ce- cea cec cee ceg cek ceo cep cer cev cga cgc cge cgg cgo cgp cgr cgv cka ckc cko co- coa coc coe cog cok coo cop cor cov cpa cpc cpe cpg cpk cpo cpp cpr cpv cra crc cre crg crk cro crp crr crv cva cvc cve cvg cvk cvo cvp cvr cvv eaa eac eae eag eak eao eap ear eav ec- eca ecc ece ecg eck eco ecr ecv eea eec eee eeg eek eeo eep eer eev ega egc ege egg ego egp egr eka ekc eke ekg eko ekp ekr ekv eo- eoa eoc eoe eog eok eoo eop eor ep- epa epc epe epg epo epp epr era erc ere erg erk ero erp err erv eva evc eve evg evo evp evr evv g-p gaa gac gae gag gak gao gap gar gav gca gcc gce gcg gck gco gcp gcr ge- gea gec gee geg gek geo gep ger gev gga ggc ggg ggo ggp ggr ggv gka gko gkp goa goc goe gog gok goo gop gor gov gpa gpc gpe gpg gpk gpo gpp gpr gra grc gre grg grk gro grp grr grv gva gvc gve gvg gvk gvo gvp gvr ka- kaa kac kae kag kak kao kap kar kav kca kcc kce kcg kck kcp kcr ke- kea kec kee keg kek keo kep ker kev kga kgc kgo kgp kgv kkc kke kkk kkp kkr kkv koa koc koe kog kok koo kop kor kpa kpc kpe kpk kpo kpp kpr kpv kra krc krg krk kro krp krr krv kva kvk kvo kvp kvr kvv oaa oac oae oag oak oao oap oar oav oc- oca occ ocg ock oco ocp ocr ocv oea oec oee oeg oeo oep oer oga ogc oge ogg ogo ogp oka okc oke okg okk oko okp okr oo- ooa ooc oog ook ooo oop oor oov op- opa opc ope opg opk opo opp opr opv or- ora orc ore org ork oro orp orr orv ov- ova ovc ove ovo ovp ovv p-p paa pac pae pag pak pao pap par pav pca pcc pce pcg pck pco pcp pcr pcv pea pec pee peg pek peo pep per pev pga pgc pge pgg pgk pgo pgp pgr pgv pka pkc pke pkg pko pkp pkr poa poc poe pog pok poo pop por pov ppa ppc ppe ppg ppk ppo ppp ppr ppv pra prc pre prg prk pro prp prr prv pva pvc pve pvg pvk pvo pvp pvr pvv ra- raa rac rae rag rak rao rap rar rav rca rcc rce rcg rco rcp rcr rcv re- rea rec ree reg rek reo rep rer rev rga rgc rge rgg rgk rgo rgp rgr rgv rkc rke rkg rkk rko rkp rkv roa roc roe rog rok roo rop ror rov rpa rpc rpe rpg rpk rpo rpp rpr rpv rra rrc rrg rrk rrp rrr rva rvc rve rvg rvo rvp rvr rvv v-a v-e vaa vac vae vag vak vao vap var vav vca vcc vce vco vcp vcr vea vec vee veg vek veo vep ver vga vgc vgg vgo vgp vgr vka vkg vkp voa voc voe vog vok voo vop vor vov vpa vpc vpe vpg vpk vpo vpp vpr vra vrc vre vrg vrk vrp vrr vva vvc vvg vvo vvr vvv