a-a a-t aaa aar aas aat aax aay ar- ara arr ars art arx ary as- asa asr ass ast asx asy at- ata atr ats att atx ax- axa axr axs axt axx ay- aya ayr ays ayt ayx ra- raa rar ras rat rax ray rra rrr rrs rrt rsa rsr rss rst rsx rta rtr rts rtt rtx rty rxr rxs ry- rya ryr rys ryy saa sar sas sat sax say sr- sra srr srs srt srx sry ss- ssa ssr sss sst ssx sta str sts stt stx sty sxs sxt sy- sya syr sys syt syx t-x taa tar tas tat tax tay tra trr trs trt trx try tsa tsr tss tst tsx tsy tta ttr tts ttt ttx tty txs txt tya tyr tys tyt xaa xar xas xat xrt xrx xry xsa xss xst xtr xts xtx xty xxx xxy xyr xyy yaa yar yas yat yax yay yra yrs yrt ysa ysr yss yst ysy yta ytr yts ytt yxa yxy yys yyt yyy