-er a-a a-c aaa aac aae aah aap aar aas aax ac- aca acc ace ach acp acr acs acx aea aec aee aeh aep aer aes aex aha ahc ahe ahh ahp ahr ahs ahx ap- apa apc ape aph app apr aps apx ar- ara arc are arh arp arr ars arx as- asa asc ase ash asp asr ass asx ax- axa axe axh axp axr axs axx c-- caa cac cae cah cap car cas cax cca ccc cce cch ccp ccr ccs ccx ce- cea cec cee ceh cep cer ces cex ch- cha chc che chh chp chr chs chx cpa cpc cpe cph cpp cpr cps cpx cra crc cre crh crp crr crs crx csa csc cse csh csp csr css csx cxc cxh cxp cxr cxs cxx eaa eac eae eah eap ear eas eax ec- eca ecc ece ech ecr ecs ecx eea eec eee eep eer ees eex eha ehc ehe ehh ehp ehr ehs ep- epa epc epe eph epp epr eps epx era erc ere erh erp err ers es- esa esc ese esh esp esr ess esx ex- exa exc exe exh exp exr exs exx haa hac hae hah hap har has hax hca hcc hce hch hcp hcr hcs he- hea hec hee heh hep her hes hex hha hhc hhe hhh hhp hhr hhs hpa hpc hpe hph hpp hpr hps hr- hra hrc hre hrh hrp hrr hrs hsa hsc hse hsh hsp hsr hss hsx hxc p-p paa pac pae pah pap par pas pax pca pcc pce pch pcp pcr pcs pcx pea pec pee peh pep per pes pex pha phc phe php phr phs phx ppa ppc ppe pph ppp ppr pps ppx pra prc pre prh prp prr prs prx ps- psa psc pse psh psp psr pss psx pxc pxe pxr pxs ra- raa rac rae rah rap rar ras rax rca rcc rce rch rcp rcr rcs rcx re- rea rec ree reh rep rer res rex rh- rha rhc rhe rhh rhp rhr rhs rpa rpc rpe rph rpp rpr rps rpx rra rrc rrh rrp rrr rrs rsa rsc rse rsh rsp rsr rss rsx rxp rxr rxs saa sac sae sah sap sar sas sax sca scc sce sch scp scr scs scx se- sea sec see seh sep ser ses sex sh- sha shc she shh shp shr shs spa spc spe sph spp spr sps spx sr- sra src sre srh srp srr srs srx ss- ssa ssc sse ssh ssp ssr sss ssx sxc sxs xaa xac xap xar xas xch xcp xcr xcx xee xep xer xes xex xhp xpa xpc xpe xpp xps xrc xrx xsa xsc xsp xss xxp xxx