a-a aaa aan aao aar aas an- ana ann ano anr ans aoa aon aoo aor aos ar- ara arn aro arr ars as- asa asn aso asr ass naa nan nao nar nas nna nnn nno nns no- noa non noo nor nos nra nrn nro nrr nrs nsa nsn nso nsr nss oaa oan oao oar oas on- ona onn ono onr ons oo- ooa oon ooo oor oos or- ora orn oro orr ors os- osa osn oso osr oss ra- raa ran rao rar ras rna rnn rno rnr rns roa ron roo ror ros rra rrn rrr rrs rsa rsn rso rsr rss saa san sao sar sas sna snn sno snr sns soa son soo sor sos sr- sra srn sro srr srs ss- ssa ssn sso ssr sss