-er a-a a-c aaa aac aae aaf aah aak aao aap aar ac- aca acc ace acf ach ack aco acp acr aea aec aee aef aeh aek aeo aep aer af- afa afc afe aff afh afk afo afp afr aha ahc ahe ahf ahh ahk aho ahp ahr aka akc ake akh akk ako akp akr aoa aoc aoe aof aoh aok aoo aop aor ap- apa apc ape apf aph apk apo app apr ar- ara arc are arf arh ark aro arp arr c-- caa cac cae caf cah cak cao cap car cca ccc cce ccf cch cck cco ccp ccr ce- cea cec cee cef ceh cek ceo cep cer cfa cfc cfe cff cfh cfk cfo cfp cfr ch- cha chc che chf chh chk cho chp chr cka ckc ckh cko co- coa coc coe cof coh cok coo cop cor cpa cpc cpe cpf cph cpk cpo cpp cpr cra crc cre crf crh crk cro crp crr eaa eac eae eaf eah eak eao eap ear ec- eca ecc ece ecf ech eck eco ecr eea eec eee eef eek eeo eep eer ef- efa efc efe eff efh efo efp efr eha ehc ehe ehf ehh eho ehp ehr eka ekc eke ekf ekh eko ekp ekr eo- eoa eoc eoe eof eoh eok eoo eop eor ep- epa epc epe epf eph epo epp epr era erc ere erf erh erk ero erp err faa fac fae faf fah fak fao fap far fca fcc fce fcf fck fco fcp fcr fea fec fee fef feh fek feo fep fer ffa ffc ffe fff ffh ffk ffo ffp ffr fha fhc fhe fhf fhh fho fhp fhr fka fkc fkf fkk fkp foa foc foe fof foh fok foo fop for fpa fpc fpe fph fpk fpo fpp fpr fra frc fre frf frh frk fro frp frr haa hac hae haf hah hak hao hap har hca hcc hce hcf hch hck hco hcp hcr he- hea hec hee hef heh hek heo hep her hfa hfc hfe hff hfh hfk hfo hfp hfr hha hhc hhe hhf hhh hhk hho hhp hhr hka hkf hkh hkk hko hkp hkr hoa hoc hoe hof hoh hok hoo hop hor hpa hpc hpe hpf hph hpk hpo hpp hpr hr- hra hrc hre hrf hrh hrk hro hrp hrr ka- kaa kac kae kaf kah kak kao kap kar kca kcc kce kch kck kcp kcr ke- kea kec kee kef keh kek keo kep ker kfa kfc kff kfh kfo kha khe khf khh khk kho khr kkc kke kkh kkk kkp kkr koa koc koe kof koh kok koo kop kor kpa kpc kpe kpf kph kpk kpo kpp kpr kra krc krf krk kro krp krr oaa oac oae oaf oah oak oao oap oar oc- oca occ ocf och ock oco ocp ocr oea oec oee oef oeh oeo oep oer of- ofa ofc ofe off ofo ofp ofr oha ohc ohe ohf ohh oho ohp ohr oka okc oke okk oko okp okr oo- ooa ooc oof ooh ook ooo oop oor op- opa opc ope opf oph opk opo opp opr or- ora orc ore orf orh ork oro orp orr p-p paa pac pae paf pah pak pao pap par pca pcc pce pcf pch pck pco pcp pcr pea pec pee pef peh pek peo pep per pfa pfc pfe pff pfk pfo pfp pfr pha phc phe phf phk pho php phr pka pkc pke pkf pko pkp pkr poa poc poe pof poh pok poo pop por ppa ppc ppe ppf pph ppk ppo ppp ppr pra prc pre prf prh prk pro prp prr ra- raa rac rae raf rah rak rao rap rar rca rcc rce rcf rch rco rcp rcr re- rea rec ree ref reh rek reo rep rer rfa rfc rfe rff rfh rfk rfo rfp rfr rh- rha rhc rhe rhf rhh rho rhp rhr rkc rke rkf rkk rko rkp roa roc roe rof roh rok roo rop ror rpa rpc rpe rpf rph rpk rpo rpp rpr rra rrc rrf rrh rrk rrp rrr