a-a a-b a-i aaa aab aai aak aan aar ab- aba abb abi abk abn abr ai- aia aib aii aik ain air aka akb aki akk akn akr an- ana anb ani ank ann anr ar- ara arb ari ark arn arr baa bab bai bak ban bar bba bbb bbi bbk bbn bbr bi- bia bib bii bik bin bir bka bkb bkk bkn bkr bna bnb bni bnk bnn bnr bra brb bri brk brn brr ia- iaa iab iai ian iar iba ibb ibi ibk ibn ibr iia iib iii iin iir ika ikb iki ikk ikr in- ina inb ini ink inn inr ir- ira irb iri irk irn irr ka- kaa kab kai kak kan kar kba kbb kbi kbk kbn kbr kia kib kii kik kin kir kkb kki kkk kkn kkr kn- kna kni knk knn knr kra kri krk krn krr n-i naa nab nai nak nan nar nba nbb nbi nbk nbn nbr nia nib nii nik nin nir nka nki nkk nkn nkr nna nnb nni nnk nnn nra nrb nri nrk nrn nrr ra- raa rab rai rak ran rar rba rbb rbi rbk rbn rbr ria rib rii rik rin rir rkb rkk rna rnb rni rnn rnr rra rrb rri rrk rrn rrr