-er -ic a-a a-c a-i a-t aaa aac aae aai aar aas aat aax ac- aca acc ace aci acr acs act acx aea aec aee aei aer aes aet aex ai- aia aic aie aii air ais ait aix ar- ara arc are ari arr ars art arx as- asa asc ase asi asr ass ast asx at- ata atc ate ati atr ats att atx ax- axa axe axi axr axs axt axx c-- caa cac cae cai car cas cat cax cca ccc cce cci ccr ccs cct ccx ce- cea cec cee cei cer ces cet cex ci- cia cic cie cii cir cis cit cix cra crc cre cri crr crs crt crx csa csc cse csi csr css cst csx cta ctc cte cti ctr cts ctt ctx cxc cxi cxr cxs cxt cxx eaa eac eae eai ear eas eat eax ec- eca ecc ece eci ecr ecs ect ecx eea eec eee eer ees eet eex eia eic eie eii eir eis eit eix era erc ere eri err ers ert es- esa esc ese esi esr ess est esx eta etc ete eti etr ets ett etx ex- exa exc exe exi exr exs ext exx ia- iaa iac iae iai iar ias iat ica icc ice ici icr ics ict ie- iea iec iee iei ier ies iet iex iia iic iie iii iir iis iit iix ir- ira irc ire iri irr irs irt irx is- isa isc ise isi isr iss ist ita itc ite iti its itt itx ixc ixe ixi ra- raa rac rae rai rar ras rat rax rca rcc rce rci rcr rcs rct rcx re- rea rec ree rei rer res ret rex ria ric rie rii rir ris rit rix rra rrc rri rrr rrs rrt rsa rsc rse rsi rsr rss rst rsx rta rtc rte rti rtr rts rtt rtx rxr rxs saa sac sae sai sar sas sat sax sca scc sce sci scr scs sct scx se- sea sec see sei ser ses set sex sia sic sie sii sir sis sit six sr- sra src sre sri srr srs srt srx ss- ssa ssc sse ssi ssr sss sst ssx sta stc ste sti str sts stt stx sxc sxi sxs sxt t-x taa tac tae tai tar tas tat tax tca tcc tce tci tcr tcs tct tcx te- tea tec tee tei ter tes tet tex tia tic tie tii tir tis tit tix tra trc tre tri trr trs trt trx tsa tsc tse tsi tsr tss tst tsx tta ttc tte tti ttr tts ttt ttx txe txi txs txt xaa xac xar xas xat xci xcr xcx xee xer xes xet xex xia xic xie xii xis xit xix xrc xrt xrx xsa xsc xsi xss xst xtc xti xtr xts xtx xxi xxx