-ic a-a a-c a-i a-t aaa aac aai aar aas aat aax ac- aca acc aci acr acs act acx ai- aia aic aii air ais ait aix ar- ara arc ari arr ars art arx as- asa asc asi asr ass ast asx at- ata atc ati atr ats att atx ax- axa axi axr axs axt axx c-- caa cac cai car cas cat cax cca ccc cci ccr ccs cct ccx ci- cia cic cii cir cis cit cix cra crc cri crr crs crt crx csa csc csi csr css cst csx cta ctc cti ctr cts ctt ctx cxc cxi cxr cxs cxt cxx ia- iaa iac iai iar ias iat ica icc ici icr ics ict iia iic iii iir iis iit iix ir- ira irc iri irr irs irt irx is- isa isc isi isr iss ist ita itc iti its itt itx ixc ixi ra- raa rac rai rar ras rat rax rca rcc rci rcr rcs rct rcx ria ric rii rir ris rit rix rra rrc rri rrr rrs rrt rsa rsc rsi rsr rss rst rsx rta rtc rti rtr rts rtt rtx rxr rxs saa sac sai sar sas sat sax sca scc sci scr scs sct scx sia sic sii sir sis sit six sr- sra src sri srr srs srt srx ss- ssa ssc ssi ssr sss sst ssx sta stc sti str sts stt stx sxc sxi sxs sxt t-x taa tac tai tar tas tat tax tca tcc tci tcr tcs tct tcx tia tic tii tir tis tit tix tra trc tri trr trs trt trx tsa tsc tsi tsr tss tst tsx tta ttc tti ttr tts ttt ttx txi txs txt xaa xac xar xas xat xci xcr xcx xia xic xii xis xit xix xrc xrt xrx xsa xsc xsi xss xst xtc xti xtr xts xtx xxi xxx