a-a a-b a-i aaa aab aag aai aan aao aas ab- aba abb abg abi abn abo abs ag- aga agb agg agi agn ago ags ai- aia aib aig aii ain aio ais an- ana anb ang ani ann ano ans aoa aob aog aoi aon aoo aos as- asa asb asg asi asn aso ass baa bab bag bai ban bao bas bba bbb bbg bbi bbn bbo bbs bga bgb bgg bgi bgn bgo bgs bi- bia bib big bii bin bio bis bna bnb bng bni bnn bno bns boa bob bog boi bon boo bos bsa bsb bsg bsi bsn bso bss gaa gab gag gai gan gao gas gba gbg gbi gbn gbo gbs gga ggb ggg ggi ggn ggo ggs gia gib gig gii gin gio gis gna gnb gni gnn gno gns goa gob gog goi gon goo gos gsa gsb gsg gsi gsn gso gss ia- iaa iab iag iai ian iao ias iba ibb ibg ibi ibn ibo ibs iga igb igg igi ign igo igs iia iib iii iin iio iis in- ina inb ing ini inn ino ins io- ioa iob iog ioi ion ioo ios is- isa isb isg isi isn iso iss n-i naa nab nag nai nan nao nas nba nbb nbg nbi nbn nbo nbs nga ngb ngg ngi ngn ngo ngs nia nib nig nii nin nio nis nna nnb nng nni nnn nno nns no- noa nob nog noi non noo nos nsa nsb nsg nsi nsn nso nss o-i oaa oab oag oai oan oao oas ob- oba obb obg obi obn obo obs oga ogg ogi ogn ogo ogs oia oib oii oin oio ois on- ona onb ong oni onn ono ons oo- ooa oob oog ooi oon ooo oos os- osa osb osg osi osn oso oss saa sab sag sai san sao sas sba sbb sbg sbi sbn sbo sbs sga sgb sgg sgi sgn sgo sgs sia sib sig sii sin sio sis sna snb sng sni snn sno sns soa sob sog soi son soo sos ss- ssa ssb ssg ssi ssn sso sss