a-a a-b a-i aaa aab aai aam aan aas ab- aba abb abi abm abn abs ai- aia aib aii aim ain ais ama amb ami amm amn ams an- ana anb ani anm ann ans as- asa asb asi asm asn ass baa bab bai bam ban bas bba bbb bbi bbm bbn bbs bi- bia bib bii bim bin bis bma bmb bmi bmm bmn bms bna bnb bni bnn bns bsa bsb bsi bsm bsn bss ia- iaa iab iai iam ian ias iba ibb ibi ibm ibn ibs iia iib iii iim iin iis im- ima imb imi imm imn ims in- ina inb ini inm inn ins is- isa isb isi ism isn iss maa mab mai mam man mas mba mbb mbi mbm mbs mi- mia mib mii mim min mis mma mmb mmi mmm mmn mms mna mnb mni mnm mnn mns msa msb msi msm msn mss n-i naa nab nai nam nan nas nba nbb nbi nbm nbn nbs nia nib nii nim nin nis nma nmb nmi nmm nmn nms nna nnb nni nnm nnn nns nsa nsb nsi nsm nsn nss saa sab sai sam san sas sba sbb sbi sbm sbn sbs sia sib sii sim sin sis sma smb smi smm smn sms sna snb sni snm snn sns ss- ssa ssb ssi ssm ssn sss