a-a a-i aaa aai aao aar aas aax ai- aia aii aio air ais aix aoa aoi aoo aor aos aox ar- ara ari aro arr ars arx as- asa asi aso asr ass asx ax- axa axi axo axr axs axx ia- iaa iai iao iar ias iia iii iio iir iis iix io- ioa ioi ioo ior ios ir- ira iri iro irr irs irx is- isa isi iso isr iss ixi o-i oaa oai oao oar oas oax oia oii oio oir ois oo- ooa ooi ooo oor oos oox or- ora ori oro orr ors orx os- osa osi oso osr oss osx ox- oxa oxi oxo oxx ra- raa rai rao rar ras rax ria rii rio rir ris rix roa roi roo ror ros rox rra rri rrr rrs rsa rsi rso rsr rss rsx rxr rxs saa sai sao sar sas sax sia sii sio sir sis six soa soi soo sor sos sox sr- sra sri sro srr srs srx ss- ssa ssi sso ssr sss ssx sxi sxs xaa xar xas xia xii xio xis xix xoa xoi xoo xor xos xox xrx xsa xsi xss xxi xxo xxx