a-a a-b a-i a-t aaa aab aag aai aan aao aas aat ab- aba abb abg abi abn abo abs abt ag- aga agb agg agi agn ago ags agt ai- aia aib aig aii ain aio ais ait an- ana anb ang ani ann ano ans ant aoa aob aog aoi aon aoo aos aot as- asa asb asg asi asn aso ass ast at- ata atb atg ati atn ato ats att baa bab bag bai ban bao bas bat bba bbb bbg bbi bbn bbo bbs bbt bga bgb bgg bgi bgn bgo bgs bgt bi- bia bib big bii bin bio bis bit bna bnb bng bni bnn bno bns bnt boa bob bog boi bon boo bos bot bsa bsb bsg bsi bsn bso bss bst bta btb btg bti btn bto bts btt gaa gab gag gai gan gao gas gat gba gbg gbi gbn gbo gbs gbt gga ggb ggg ggi ggn ggo ggs ggt gia gib gig gii gin gio gis git gna gnb gni gnn gno gns gnt goa gob gog goi gon goo gos got gsa gsb gsg gsi gsn gso gss gst gta gtb gtg gti gtn gto gts gtt ia- iaa iab iag iai ian iao ias iat iba ibb ibg ibi ibn ibo ibs ibt iga igb igg igi ign igo igs igt iia iib iii iin iio iis iit in- ina inb ing ini inn ino ins int io- ioa iob iog ioi ion ioo ios iot is- isa isb isg isi isn iso iss ist ita itb itg iti itn ito its itt n-i naa nab nag nai nan nao nas nat nba nbb nbg nbi nbn nbo nbs nbt nga ngb ngg ngi ngn ngo ngs ngt nia nib nig nii nin nio nis nit nna nnb nng nni nnn nno nns nnt no- noa nob nog noi non noo nos not nsa nsb nsg nsi nsn nso nss nst nta ntb ntg nti ntn nto nts ntt o-i oaa oab oag oai oan oao oas oat ob- oba obb obg obi obn obo obs obt oga ogg ogi ogn ogo ogs ogt oia oib oii oin oio ois oit on- ona onb ong oni onn ono ons ont oo- ooa oob oog ooi oon ooo oos oot os- osa osb osg osi osn oso oss ost ot- ota otb otg oti otn oto ots ott saa sab sag sai san sao sas sat sba sbb sbg sbi sbn sbo sbs sbt sga sgb sgg sgi sgn sgo sgs sgt sia sib sig sii sin sio sis sit sna snb sng sni snn sno sns snt soa sob sog soi son soo sos sot ss- ssa ssb ssg ssi ssn sso sss sst sta stb stg sti stn sto sts stt taa tab tag tai tan tao tas tat tba tbb tbg tbi tbn tbo tbs tbt tga tgb tgg tgi tgn tgo tgs tgt tia tib tig tii tin tio tis tit tna tnb tng tni tnn tno tns tnt to- toa tob tog toi ton too tos tot tsa tsb tsg tsi tsn tso tss tst tta ttb ttg tti ttn tto tts ttt