a-a a-b a-q aaa aab aan aaq aar aas ab- aba abb abn abq abr abs an- ana anb ann anq anr ans aqa aqn aqr aqs ar- ara arb arn arq arr ars as- asa asb asn asq asr ass baa bab ban baq bar bas bba bbb bbn bbq bbr bbs bna bnb bnn bnr bns bra brb brn brq brr brs bsa bsb bsn bsr bss naa nab nan nar nas nba nbb nbn nbr nbs nna nnb nnn nns nqs nra nrb nrn nrr nrs nsa nsb nsn nsr nss qaa qan qar qas qba qbq qbs qnb qns qqq qra qrb qrs qsa qsr ra- raa rab ran raq rar ras rba rbb rbn rbr rbs rna rnb rnn rnr rns rqn rqs rra rrb rrn rrq rrr rrs rsa rsb rsn rsq rsr rss saa sab san saq sar sas sba sbb sbn sbq sbr sbs sna snb snn snr sns sqa sqn sqq sqr sqs sr- sra srb srn srq srr srs ss- ssa ssb ssn ssq ssr sss