a-a a-b a-i aaa aab aai aak aan aas ab- aba abb abi abk abn abs ai- aia aib aii aik ain ais aka akb aki akk akn aks an- ana anb ani ank ann ans as- asa asb asi ask asn ass baa bab bai bak ban bas bba bbb bbi bbk bbn bbs bi- bia bib bii bik bin bis bka bkb bkk bkn bks bna bnb bni bnk bnn bns bsa bsb bsi bsk bsn bss ia- iaa iab iai ian ias iba ibb ibi ibk ibn ibs iia iib iii iin iis ika ikb iki ikk iks in- ina inb ini ink inn ins is- isa isb isi isk isn iss ka- kaa kab kai kak kan kas kba kbb kbi kbk kbn kbs kia kib kii kik kin kis kkb kki kkk kkn kks kn- kna kni knk knn ksa ksb ksi ksk ksn kss n-i naa nab nai nak nan nas nba nbb nbi nbk nbn nbs nia nib nii nik nin nis nka nki nkk nkn nks nna nnb nni nnk nnn nns nsa nsb nsi nsk nsn nss saa sab sai sak san sas sba sbb sbi sbk sbn sbs sia sib sii sik sin sis sk- ska skb ski skk sks sna snb sni snk snn sns ss- ssa ssb ssi ssk ssn sss