-er a-a a-c aaa aac aae aah aar aas aax ac- aca acc ace ach acr acs acx aea aec aee aeh aer aes aex aha ahc ahe ahh ahr ahs ahx ar- ara arc are arh arr ars arx as- asa asc ase ash asr ass asx ax- axa axe axh axr axs axx c-- caa cac cae cah car cas cax cca ccc cce cch ccr ccs ccx ce- cea cec cee ceh cer ces cex ch- cha chc che chh chr chs chx cra crc cre crh crr crs crx csa csc cse csh csr css csx cxc cxh cxr cxs cxx eaa eac eae eah ear eas eax ec- eca ecc ece ech ecr ecs ecx eea eec eee eer ees eex eha ehc ehe ehh ehr ehs era erc ere erh err ers es- esa esc ese esh esr ess esx ex- exa exc exe exh exr exs exx haa hac hae hah har has hax hca hcc hce hch hcr hcs he- hea hec hee heh her hes hex hha hhc hhe hhh hhr hhs hr- hra hrc hre hrh hrr hrs hsa hsc hse hsh hsr hss hsx hxc ra- raa rac rae rah rar ras rax rca rcc rce rch rcr rcs rcx re- rea rec ree reh rer res rex rh- rha rhc rhe rhh rhr rhs rra rrc rrh rrr rrs rsa rsc rse rsh rsr rss rsx rxr rxs saa sac sae sah sar sas sax sca scc sce sch scr scs scx se- sea sec see seh ser ses sex sh- sha shc she shh shr shs sr- sra src sre srh srr srs srx ss- ssa ssc sse ssh ssr sss ssx sxc sxs xaa xac xar xas xch xcr xcx xee xer xes xex xrc xrx xsa xsc xss xxx