a-a a-b a-i aaa aab aag aai aak aan aao aas ab- aba abb abg abi abk abn abo abs ag- aga agb agg agi agk agn ago ags ai- aia aib aig aii aik ain aio ais aka akb akg aki akk akn ako aks an- ana anb ang ani ank ann ano ans aoa aob aog aoi aok aon aoo aos as- asa asb asg asi ask asn aso ass baa bab bag bai bak ban bao bas bba bbb bbg bbi bbk bbn bbo bbs bga bgb bgg bgi bgk bgn bgo bgs bi- bia bib big bii bik bin bio bis bka bkb bkg bkk bkn bko bks bna bnb bng bni bnk bnn bno bns boa bob bog boi bok bon boo bos bsa bsb bsg bsi bsk bsn bso bss gaa gab gag gai gak gan gao gas gba gbg gbi gbk gbn gbo gbs gga ggb ggg ggi ggn ggo ggs gia gib gig gii gik gin gio gis gka gkb gkn gko gks gna gnb gni gnn gno gns goa gob gog goi gok gon goo gos gsa gsb gsg gsi gsk gsn gso gss ia- iaa iab iag iai ian iao ias iba ibb ibg ibi ibk ibn ibo ibs iga igb igg igi igk ign igo igs iia iib iii iin iio iis ika ikb iki ikk iko iks in- ina inb ing ini ink inn ino ins io- ioa iob iog ioi ion ioo ios is- isa isb isg isi isk isn iso iss ka- kaa kab kag kai kak kan kao kas kba kbb kbi kbk kbn kbo kbs kga kgb kgi kgo kgs kia kib kig kii kik kin kio kis kkb kki kkk kkn kks kn- kna kng kni knk knn kno koa kob kog koi kok kon koo kos ksa ksb ksg ksi ksk ksn kso kss n-i naa nab nag nai nak nan nao nas nba nbb nbg nbi nbk nbn nbo nbs nga ngb ngg ngi ngk ngn ngo ngs nia nib nig nii nik nin nio nis nka nki nkk nkn nko nks nna nnb nng nni nnk nnn nno nns no- noa nob nog noi nok non noo nos nsa nsb nsg nsi nsk nsn nso nss o-i oaa oab oag oai oak oan oao oas ob- oba obb obg obi obk obn obo obs oga ogg ogi ogn ogo ogs oia oib oii oik oin oio ois oka okb okg oki okk oko oks on- ona onb ong oni onk onn ono ons oo- ooa oob oog ooi ook oon ooo oos os- osa osb osg osi osk osn oso oss saa sab sag sai sak san sao sas sba sbb sbg sbi sbk sbn sbo sbs sga sgb sgg sgi sgk sgn sgo sgs sia sib sig sii sik sin sio sis sk- ska skb skg ski skk sko sks sna snb sng sni snk snn sno sns soa sob sog soi sok son soo sos ss- ssa ssb ssg ssi ssk ssn sso sss