-er a-a a-c aaa aac aae aaf aag aah aao aar ac- aca acc ace acf acg ach aco acr aea aec aee aef aeg aeh aeo aer af- afa afc afe aff afg afh afo afr ag- aga agc age agf agg agh ago agr aha ahc ahe ahf ahg ahh aho ahr aoa aoc aoe aof aog aoh aoo aor ar- ara arc are arf arg arh aro arr c-- caa cac cae caf cag cah cao car cca ccc cce ccf ccg cch cco ccr ce- cea cec cee cef ceg ceh ceo cer cfa cfc cfe cff cfg cfh cfo cfr cga cgc cge cgg cgh cgo cgr ch- cha chc che chf chg chh cho chr co- coa coc coe cof cog coh coo cor cra crc cre crf crg crh cro crr eaa eac eae eaf eag eah eao ear ec- eca ecc ece ecf ecg ech eco ecr eea eec eee eef eeg eeo eer ef- efa efc efe eff efg efh efo efr ega egc ege egf egg egh ego egr eha ehc ehe ehf ehg ehh eho ehr eo- eoa eoc eoe eof eog eoh eoo eor era erc ere erf erg erh ero err faa fac fae faf fag fah fao far fca fcc fce fcf fcg fco fcr fea fec fee fef feg feh feo fer ffa ffc ffe fff ffg ffh ffo ffr fga fgc fge fgf fgg fgh fgr fha fhc fhe fhf fhg fhh fho fhr foa foc foe fof fog foh foo for fra frc fre frf frg frh fro frr gaa gac gae gaf gag gah gao gar gca gcc gce gcf gcg gch gco gcr ge- gea gec gee gef geg geh geo ger gfa gfc gfe gff gfh gfo gfr gga ggc ggg ggh ggo ggr gha ghc ghe ghg ghh gho ghr goa goc goe gof gog goh goo gor gra grc gre grf grg grh gro grr haa hac hae haf hag hah hao har hca hcc hce hcf hcg hch hco hcr he- hea hec hee hef heg heh heo her hfa hfc hfe hff hfg hfh hfo hfr hga hgc hge hgf hgg hgh hgo hgr hha hhc hhe hhf hhg hhh hho hhr hoa hoc hoe hof hog hoh hoo hor hr- hra hrc hre hrf hrg hrh hro hrr oaa oac oae oaf oag oah oao oar oc- oca occ ocf ocg och oco ocr oea oec oee oef oeg oeh oeo oer of- ofa ofc ofe off ofg ofo ofr oga ogc oge ogf ogg ogh ogo oha ohc ohe ohf ohg ohh oho ohr oo- ooa ooc oof oog ooh ooo oor or- ora orc ore orf org orh oro orr ra- raa rac rae raf rag rah rao rar rca rcc rce rcf rcg rch rco rcr re- rea rec ree ref reg reh reo rer rfa rfc rfe rff rfg rfh rfo rfr rga rgc rge rgf rgg rgh rgo rgr rh- rha rhc rhe rhf rhg rhh rho rhr roa roc roe rof rog roh roo ror rra rrc rrf rrg rrh rrr