a-a a-b a-i aaa aab aag aai aan aao aar aas ab- aba abb abg abi abn abo abr abs ag- aga agb agg agi agn ago agr ags ai- aia aib aig aii ain aio air ais an- ana anb ang ani ann ano anr ans aoa aob aog aoi aon aoo aor aos ar- ara arb arg ari arn aro arr ars as- asa asb asg asi asn aso asr ass baa bab bag bai ban bao bar bas bba bbb bbg bbi bbn bbo bbr bbs bga bgb bgg bgi bgn bgo bgr bgs bi- bia bib big bii bin bio bir bis bna bnb bng bni bnn bno bnr bns boa bob bog boi bon boo bor bos bra brb brg bri brn bro brr brs bsa bsb bsg bsi bsn bso bsr bss gaa gab gag gai gan gao gar gas gba gbg gbi gbn gbo gbr gbs gga ggb ggg ggi ggn ggo ggr ggs gia gib gig gii gin gio gir gis gna gnb gni gnn gno gnr gns goa gob gog goi gon goo gor gos gra grb grg gri grn gro grr grs gsa gsb gsg gsi gsn gso gsr gss ia- iaa iab iag iai ian iao iar ias iba ibb ibg ibi ibn ibo ibr ibs iga igb igg igi ign igo igr igs iia iib iii iin iio iir iis in- ina inb ing ini inn ino inr ins io- ioa iob iog ioi ion ioo ior ios ir- ira irb irg iri irn iro irr irs is- isa isb isg isi isn iso isr iss n-i naa nab nag nai nan nao nar nas nba nbb nbg nbi nbn nbo nbr nbs nga ngb ngg ngi ngn ngo ngs nia nib nig nii nin nio nir nis nna nnb nng nni nnn nno nns no- noa nob nog noi non noo nor nos nra nrb nrg nri nrn nro nrr nrs nsa nsb nsg nsi nsn nso nsr nss o-i oaa oab oag oai oan oao oar oas ob- oba obb obg obi obn obo obr obs oga ogg ogi ogn ogo ogs oia oib oii oin oio oir ois on- ona onb ong oni onn ono onr ons oo- ooa oob oog ooi oon ooo oor oos or- ora orb org ori orn oro orr ors os- osa osb osg osi osn oso osr oss ra- raa rab rag rai ran rao rar ras rba rbb rbg rbi rbn rbo rbr rbs rga rgb rgg rgi rgn rgo rgr rgs ria rib rig rii rin rio rir ris rna rnb rng rni rnn rno rnr rns roa rob rog roi ron roo ror ros rra rrb rrg rri rrn rrr rrs rsa rsb rsg rsi rsn rso rsr rss saa sab sag sai san sao sar sas sba sbb sbg sbi sbn sbo sbr sbs sga sgb sgg sgi sgn sgo sgr sgs sia sib sig sii sin sio sir sis sna snb sng sni snn sno snr sns soa sob sog soi son soo sor sos sr- sra srb srg sri srn sro srr srs ss- ssa ssb ssg ssi ssn sso ssr sss