a-a aaa aan aao aar aas aau an- ana ann ano anr ans anu aoa aon aoo aor aos aou ar- ara arn aro arr ars aru as- asa asn aso asr ass asu au- aua aun auo aur aus naa nan nao nar nas nau nna nnn nno nns nnu no- noa non noo nor nos nou nra nrn nro nrr nrs nru nsa nsn nso nsr nss nsu nua nun nuo nur nus nuu oaa oan oao oar oas oau on- ona onn ono onr ons onu oo- ooa oon ooo oor oos or- ora orn oro orr ors oru os- osa osn oso osr oss osu ou- oua oun ouo our ous ra- raa ran rao rar ras rau rna rnn rno rnr rns rnu roa ron roo ror ros rou rra rrn rrr rrs rru rsa rsn rso rsr rss rsu rua run ruo rur rus ruu saa san sao sar sas sau sna snn sno snr sns snu soa son soo sor sos sou sr- sra srn sro srr srs ss- ssa ssn sso ssr sss ssu sua sun suo sur sus suu ua- uaa uan uao uar uas uau un- una unn uno unr uns unu uoa uon uoo uor uos ur- ura urn uro urr urs uru usa usn uso usr uss usu uua uun uur uus uuu