a-a a-b a-i aaa aab aai aam aan aar aas ab- aba abb abi abm abn abr abs ai- aia aib aii aim ain air ais ama amb ami amm amn amr ams an- ana anb ani anm ann anr ans ar- ara arb ari arm arn arr ars as- asa asb asi asm asn asr ass baa bab bai bam ban bar bas bba bbb bbi bbm bbn bbr bbs bi- bia bib bii bim bin bir bis bma bmb bmi bmm bmn bmr bms bna bnb bni bnn bnr bns bra brb bri brm brn brr brs bsa bsb bsi bsm bsn bsr bss ia- iaa iab iai iam ian iar ias iba ibb ibi ibm ibn ibr ibs iia iib iii iim iin iir iis im- ima imb imi imm imn ims in- ina inb ini inm inn inr ins ir- ira irb iri irm irn irr irs is- isa isb isi ism isn isr iss m-r maa mab mai mam man mar mas mba mbb mbi mbm mbr mbs mi- mia mib mii mim min mir mis mma mmb mmi mmm mmn mmr mms mna mnb mni mnm mnn mnr mns mra mrb mri mrm mrn mrr mrs msa msb msi msm msn msr mss n-i naa nab nai nam nan nar nas nba nbb nbi nbm nbn nbr nbs nia nib nii nim nin nir nis nma nmb nmi nmm nmn nmr nms nna nnb nni nnm nnn nns nra nrb nri nrm nrn nrr nrs nsa nsb nsi nsm nsn nsr nss ra- raa rab rai ram ran rar ras rba rbb rbi rbm rbn rbr rbs ria rib rii rim rin rir ris rma rmb rmi rmm rmn rmr rms rna rnb rni rnm rnn rnr rns rra rrb rri rrm rrn rrr rrs rsa rsb rsi rsm rsn rsr rss saa sab sai sam san sar sas sba sbb sbi sbm sbn sbr sbs sia sib sii sim sin sir sis sma smb smi smm smn smr sms sna snb sni snm snn snr sns sr- sra srb sri srm srn srr srs ss- ssa ssb ssi ssm ssn ssr sss