a-a a-b a-i aaa aab aai aam aan aao aas ab- aba abb abi abm abn abo abs ai- aia aib aii aim ain aio ais ama amb ami amm amn amo ams an- ana anb ani anm ann ano ans aoa aob aoi aom aon aoo aos as- asa asb asi asm asn aso ass baa bab bai bam ban bao bas bba bbb bbi bbm bbn bbo bbs bi- bia bib bii bim bin bio bis bma bmb bmi bmm bmn bmo bms bna bnb bni bnn bno bns boa bob boi bom bon boo bos bsa bsb bsi bsm bsn bso bss ia- iaa iab iai iam ian iao ias iba ibb ibi ibm ibn ibo ibs iia iib iii iim iin iio iis im- ima imb imi imm imn imo ims in- ina inb ini inm inn ino ins io- ioa iob ioi iom ion ioo ios is- isa isb isi ism isn iso iss m-o maa mab mai mam man mao mas mba mbb mbi mbm mbo mbs mi- mia mib mii mim min mio mis mma mmb mmi mmm mmn mmo mms mna mnb mni mnm mnn mno mns moa mob moi mom mon moo mos msa msb msi msm msn mso mss n-i naa nab nai nam nan nao nas nba nbb nbi nbm nbn nbo nbs nia nib nii nim nin nio nis nma nmb nmi nmm nmn nmo nms nna nnb nni nnm nnn nno nns no- noa nob noi nom non noo nos nsa nsb nsi nsm nsn nso nss o-i oaa oab oai oam oan oao oas ob- oba obb obi obm obn obo obs oia oib oii oim oin oio ois om- oma omb omi omm omn omo oms on- ona onb oni onn ono ons oo- ooa oob ooi oom oon ooo oos os- osa osb osi osm osn oso oss saa sab sai sam san sao sas sba sbb sbi sbm sbn sbo sbs sia sib sii sim sin sio sis sma smb smi smm smn smo sms sna snb sni snm snn sno sns soa sob soi som son soo sos ss- ssa ssb ssi ssm ssn sso sss