a-a a-b a-i aaa aab aai aak aam aan aao aas ab- aba abb abi abk abm abn abo abs ai- aia aib aii aik aim ain aio ais aka akb aki akk akm akn ako aks ama amb ami amk amm amn amo ams an- ana anb ani ank anm ann ano ans aoa aob aoi aok aom aon aoo aos as- asa asb asi ask asm asn aso ass baa bab bai bak bam ban bao bas bba bbb bbi bbk bbm bbn bbo bbs bi- bia bib bii bik bim bin bio bis bka bkb bkk bkm bkn bko bks bma bmb bmi bmk bmm bmn bmo bms bna bnb bni bnk bnn bno bns boa bob boi bok bom bon boo bos bsa bsb bsi bsk bsm bsn bso bss ia- iaa iab iai iam ian iao ias iba ibb ibi ibk ibm ibn ibo ibs iia iib iii iim iin iio iis ika ikb iki ikk iko iks im- ima imb imi imm imn imo ims in- ina inb ini ink inm inn ino ins io- ioa iob ioi iom ion ioo ios is- isa isb isi isk ism isn iso iss ka- kaa kab kai kak kam kan kao kas kba kbb kbi kbk kbm kbn kbo kbs kia kib kii kik kim kin kio kis kkb kki kkk kkm kkn kks kma kmb kmi kmk kmm kmo kms kn- kna kni knk knm knn kno koa kob koi kok kom kon koo kos ksa ksb ksi ksk ksm ksn kso kss m-o maa mab mai mak mam man mao mas mba mbb mbi mbk mbm mbo mbs mi- mia mib mii mik mim min mio mis mka mkb mkk mkm mkn mko mks mma mmb mmi mmk mmm mmn mmo mms mna mnb mni mnk mnm mnn mno mns moa mob moi mok mom mon moo mos msa msb msi msk msm msn mso mss n-i naa nab nai nak nam nan nao nas nba nbb nbi nbk nbm nbn nbo nbs nia nib nii nik nim nin nio nis nka nki nkk nkm nkn nko nks nma nmb nmi nmk nmm nmn nmo nms nna nnb nni nnk nnm nnn nno nns no- noa nob noi nok nom non noo nos nsa nsb nsi nsk nsm nsn nso nss o-i oaa oab oai oak oam oan oao oas ob- oba obb obi obk obm obn obo obs oia oib oii oik oim oin oio ois oka okb oki okk oko oks om- oma omb omi omm omn omo oms on- ona onb oni onk onn ono ons oo- ooa oob ooi ook oom oon ooo oos os- osa osb osi osk osm osn oso oss saa sab sai sak sam san sao sas sba sbb sbi sbk sbm sbn sbo sbs sia sib sii sik sim sin sio sis sk- ska skb ski skk skm sko sks sma smb smi smk smm smn smo sms sna snb sni snk snm snn sno sns soa sob soi sok som son soo sos ss- ssa ssb ssi ssk ssm ssn sso sss