a-a a-b a-i aaa aab aag aai aak aan aao aar ab- aba abb abg abi abk abn abo abr ag- aga agb agg agi agk agn ago agr ai- aia aib aig aii aik ain aio air aka akb akg aki akk akn ako akr an- ana anb ang ani ank ann ano anr aoa aob aog aoi aok aon aoo aor ar- ara arb arg ari ark arn aro arr baa bab bag bai bak ban bao bar bba bbb bbg bbi bbk bbn bbo bbr bga bgb bgg bgi bgk bgn bgo bgr bi- bia bib big bii bik bin bio bir bka bkb bkg bkk bkn bko bkr bna bnb bng bni bnk bnn bno bnr boa bob bog boi bok bon boo bor bra brb brg bri brk brn bro brr gaa gab gag gai gak gan gao gar gba gbg gbi gbk gbn gbo gbr gga ggb ggg ggi ggn ggo ggr gia gib gig gii gik gin gio gir gka gkb gkn gko gna gnb gni gnn gno gnr goa gob gog goi gok gon goo gor gra grb grg gri grk grn gro grr ia- iaa iab iag iai ian iao iar iba ibb ibg ibi ibk ibn ibo ibr iga igb igg igi igk ign igo igr iia iib iii iin iio iir ika ikb iki ikk iko ikr in- ina inb ing ini ink inn ino inr io- ioa iob iog ioi ion ioo ior ir- ira irb irg iri irk irn iro irr ka- kaa kab kag kai kak kan kao kar kba kbb kbi kbk kbn kbo kbr kga kgb kgi kgo kia kib kig kii kik kin kio kir kkb kki kkk kkn kkr kn- kna kng kni knk knn kno knr koa kob kog koi kok kon koo kor kra krg kri krk krn kro krr n-i naa nab nag nai nak nan nao nar nba nbb nbg nbi nbk nbn nbo nbr nga ngb ngg ngi ngk ngn ngo nia nib nig nii nik nin nio nir nka nki nkk nkn nko nkr nna nnb nng nni nnk nnn nno no- noa nob nog noi nok non noo nor nra nrb nrg nri nrk nrn nro nrr o-i oaa oab oag oai oak oan oao oar ob- oba obb obg obi obk obn obo obr oga ogg ogi ogn ogo oia oib oii oik oin oio oir oka okb okg oki okk oko okr on- ona onb ong oni onk onn ono onr oo- ooa oob oog ooi ook oon ooo oor or- ora orb org ori ork orn oro orr ra- raa rab rag rai rak ran rao rar rba rbb rbg rbi rbk rbn rbo rbr rga rgb rgg rgi rgk rgn rgo rgr ria rib rig rii rik rin rio rir rkb rkg rkk rko rna rnb rng rni rnn rno rnr roa rob rog roi rok ron roo ror rra rrb rrg rri rrk rrn rrr