a-a a-i a-t aaa aai aar aas aat aax ai- aia aii air ais ait aix ar- ara ari arr ars art arx as- asa asi asr ass ast asx at- ata ati atr ats att atx ax- axa axi axr axs axt axx ia- iaa iai iar ias iat iia iii iir iis iit iix ir- ira iri irr irs irt irx is- isa isi isr iss ist ita iti its itt itx ixi ra- raa rai rar ras rat rax ria rii rir ris rit rix rra rri rrr rrs rrt rsa rsi rsr rss rst rsx rta rti rtr rts rtt rtx rxr rxs saa sai sar sas sat sax sia sii sir sis sit six sr- sra sri srr srs srt srx ss- ssa ssi ssr sss sst ssx sta sti str sts stt stx sxi sxs sxt t-x taa tai tar tas tat tax tia tii tir tis tit tix tra tri trr trs trt trx tsa tsi tsr tss tst tsx tta tti ttr tts ttt ttx txi txs txt xaa xar xas xat xia xii xis xit xix xrt xrx xsa xsi xss xst xti xtr xts xtx xxi xxx