-er -ic a-a a-c a-i aaa aac aae aai aap aar aas aax ac- aca acc ace aci acp acr acs acx aea aec aee aei aep aer aes aex ai- aia aic aie aii aip air ais aix ap- apa apc ape api app apr aps apx ar- ara arc are ari arp arr ars arx as- asa asc ase asi asp asr ass asx ax- axa axe axi axp axr axs axx c-- caa cac cae cai cap car cas cax cca ccc cce cci ccp ccr ccs ccx ce- cea cec cee cei cep cer ces cex ci- cia cic cie cii cip cir cis cix cpa cpc cpe cpi cpp cpr cps cpx cra crc cre cri crp crr crs crx csa csc cse csi csp csr css csx cxc cxi cxp cxr cxs cxx eaa eac eae eai eap ear eas eax ec- eca ecc ece eci ecr ecs ecx eea eec eee eep eer ees eex eia eic eie eii eip eir eis eix ep- epa epc epe epi epp epr eps epx era erc ere eri erp err ers es- esa esc ese esi esp esr ess esx ex- exa exc exe exi exp exr exs exx ia- iaa iac iae iai iap iar ias ica icc ice ici icp icr ics ie- iea iec iee iei iep ier ies iex iia iic iie iii iip iir iis iix ipa ipc ipe ipi ipp ipr ips ipx ir- ira irc ire iri irp irr irs irx is- isa isc ise isi isp isr iss ixc ixe ixi p-p paa pac pae pai pap par pas pax pca pcc pce pci pcp pcr pcs pcx pea pec pee pei pep per pes pex pia pic pie pii pip pir pis pix ppa ppc ppe ppi ppp ppr pps ppx pra prc pre pri prp prr prs prx ps- psa psc pse psi psp psr pss psx pxc pxe pxr pxs ra- raa rac rae rai rap rar ras rax rca rcc rce rci rcp rcr rcs rcx re- rea rec ree rei rep rer res rex ria ric rie rii rip rir ris rix rpa rpc rpe rpi rpp rpr rps rpx rra rrc rri rrp rrr rrs rsa rsc rse rsi rsp rsr rss rsx rxp rxr rxs saa sac sae sai sap sar sas sax sca scc sce sci scp scr scs scx se- sea sec see sei sep ser ses sex sia sic sie sii sip sir sis six spa spc spe spi spp spr sps spx sr- sra src sre sri srp srr srs srx ss- ssa ssc sse ssi ssp ssr sss ssx sxc sxi sxs xaa xac xap xar xas xci xcp xcr xcx xee xep xer xes xex xia xic xie xii xis xix xpa xpc xpe xpp xps xrc xrx xsa xsc xsi xsp xss xxi xxp xxx