a-a a-t aaa aar aas aat aau aax ar- ara arr ars art aru arx as- asa asr ass ast asu asx at- ata atr ats att atu atx au- aua aur aus aut aux ax- axa axr axs axt axx ra- raa rar ras rat rau rax rra rrr rrs rrt rru rsa rsr rss rst rsu rsx rta rtr rts rtt rtu rtx rua rur rus rut ruu rux rxr rxs saa sar sas sat sau sax sr- sra srr srs srt srx ss- ssa ssr sss sst ssu ssx sta str sts stt stu stx sua sur sus sut suu sux sxs sxt sxu t-x taa tar tas tat tau tax tra trr trs trt tru trx tsa tsr tss tst tsu tsx tta ttr tts ttt ttu ttx tua tur tus tut tuu tux txs txt txu ua- uaa uar uas uat uau ur- ura urr urs urt uru urx usa usr uss ust usu usx uta utr uts utt utu utx uua uur uus uut uuu uxr uxt uxu xaa xar xas xat xau xrt xrx xsa xss xst xtr xts xtx xus xxx