a-a a-t aaa aao aar aas aat aoa aoo aor aos aot ar- ara aro arr ars art as- asa aso asr ass ast at- ata ato atr ats att oaa oao oar oas oat oo- ooa ooo oor oos oot or- ora oro orr ors ort os- osa oso osr oss ost ot- ota oto otr ots ott ra- raa rao rar ras rat roa roo ror ros rot rra rrr rrs rrt rsa rso rsr rss rst rta rto rtr rts rtt saa sao sar sas sat soa soo sor sos sot sr- sra sro srr srs srt ss- ssa sso ssr sss sst sta sto str sts stt taa tao tar tas tat to- toa too tor tos tot tra tro trr trs trt tsa tso tsr tss tst tta tto ttr tts ttt