-er a-a a-c aaa aac aae aaf aah aao aar aas aax ac- aca acc ace acf ach aco acr acs acx aea aec aee aef aeh aeo aer aes aex af- afa afc afe aff afh afo afr afs afx aha ahc ahe ahf ahh aho ahr ahs ahx aoa aoc aoe aof aoh aoo aor aos aox ar- ara arc are arf arh aro arr ars arx as- asa asc ase asf ash aso asr ass asx ax- axa axe axh axo axr axs axx c-- caa cac cae caf cah cao car cas cax cca ccc cce ccf cch cco ccr ccs ccx ce- cea cec cee cef ceh ceo cer ces cex cfa cfc cfe cff cfh cfo cfr cfs cfx ch- cha chc che chf chh cho chr chs chx co- coa coc coe cof coh coo cor cos cox cra crc cre crf crh cro crr crs crx csa csc cse csf csh cso csr css csx cxc cxf cxh cxo cxr cxs cxx eaa eac eae eaf eah eao ear eas eax ec- eca ecc ece ecf ech eco ecr ecs ecx eea eec eee eef eeo eer ees eex ef- efa efc efe eff efh efo efr efs efx eha ehc ehe ehf ehh eho ehr ehs eo- eoa eoc eoe eof eoh eoo eor eos era erc ere erf erh ero err ers es- esa esc ese esf esh eso esr ess esx ex- exa exc exe exh exo exr exs exx faa fac fae faf fah fao far fas fax fca fcc fce fcf fco fcr fcs fcx fea fec fee fef feh feo fer fes fex ffa ffc ffe fff ffh ffo ffr ffs ffx fha fhc fhe fhf fhh fho fhr fhs foa foc foe fof foh foo for fos fox fra frc fre frf frh fro frr frs fsa fsc fse fsf fsh fso fsr fss fsx fxe fxr fxs fxx haa hac hae haf hah hao har has hax hca hcc hce hcf hch hco hcr hcs he- hea hec hee hef heh heo her hes hex hfa hfc hfe hff hfh hfo hfr hfs hha hhc hhe hhf hhh hho hhr hhs hoa hoc hoe hof hoh hoo hor hos hox hr- hra hrc hre hrf hrh hro hrr hrs hsa hsc hse hsf hsh hsr hss hsx hxc oaa oac oae oaf oah oao oar oas oax oc- oca occ ocf och oco ocr ocs ocx oea oec oee oef oeh oeo oer oes oex of- ofa ofc ofe off ofo ofr ofs ofx oha ohc ohe ohf ohh oho ohr ohs oo- ooa ooc oof ooh ooo oor oos oox or- ora orc ore orf orh oro orr ors orx os- osa osc ose osf osh oso osr oss osx ox- oxa oxc oxf oxo oxx ra- raa rac rae raf rah rao rar ras rax rca rcc rce rcf rch rco rcr rcs rcx re- rea rec ree ref reh reo rer res rex rfa rfc rfe rff rfh rfo rfr rfs rh- rha rhc rhe rhf rhh rho rhr rhs roa roc roe rof roh roo ror ros rox rra rrc rrf rrh rrr rrs rsa rsc rse rsf rsh rso rsr rss rsx rxr rxs saa sac sae saf sah sao sar sas sax sca scc sce scf sch sco scr scs scx se- sea sec see sef seh seo ser ses sex sfa sfc sfe sff sfh sfo sfr sfs sfx sh- sha shc she shf shh sho shr shs soa soc soe sof soh soo sor sos sox sr- sra src sre srf srh sro srr srs srx ss- ssa ssc sse ssf ssh sso ssr sss ssx sxc sxs xaa xac xaf xar xas xcf xch xcr xcx xee xer xes xex xfa xfe xfh xfs xfx xoa xoc xof xoo xor xos xox xrc xrf xrx xsa xsc xss xxo xxx