a-a a-t aaa aao aar aas aat aax aoa aoo aor aos aot aox ar- ara aro arr ars art arx as- asa aso asr ass ast asx at- ata ato atr ats att atx ax- axa axo axr axs axt axx oaa oao oar oas oat oax oo- ooa ooo oor oos oot oox or- ora oro orr ors ort orx os- osa oso osr oss ost osx ot- ota oto otr ots ott ox- oxa oxo oxt oxx ra- raa rao rar ras rat rax roa roo ror ros rot rox rra rrr rrs rrt rsa rso rsr rss rst rsx rta rto rtr rts rtt rtx rxr rxs saa sao sar sas sat sax soa soo sor sos sot sox sr- sra sro srr srs srt srx ss- ssa sso ssr sss sst ssx sta sto str sts stt stx sxs sxt t-x taa tao tar tas tat tax to- toa too tor tos tot tox tra tro trr trs trt trx tsa tso tsr tss tst tsx tta tto ttr tts ttt ttx txs txt xaa xar xas xat xoa xoo xor xos xot xox xrt xrx xsa xss xst xtr xts xtx xxo xxx