a-a a-b a-i a-t aaa aab aae aai aak aan aas aat ab- aba abb abe abi abk abn abs abt aea aeb aee aei aek aen aes aet ai- aia aib aie aii aik ain ais ait aka akb ake aki akk akn aks an- ana anb ane ani ank ann ans ant as- asa asb ase asi ask asn ass ast at- ata atb ate ati atn ats att baa bab bae bai bak ban bas bat bba bbb bbe bbi bbk bbn bbs bbt be- bea beb bee bei bek ben bes bet bi- bia bib bie bii bik bin bis bit bka bkb bke bkk bkn bks bkt bna bnb bne bni bnk bnn bns bnt bsa bsb bse bsi bsk bsn bss bst bta btb bte bti btk btn bts btt eaa eab eae eai eak ean eas eat eba ebb ebe ebi ebk ebn ebs ebt eea eeb eee eek een ees eet eia eib eie eii eik ein eis eit eka ekb eke eki eks ekt en- ena enb ene eni enk enn ens ent es- esa esb ese esi esk esn ess est eta etb ete eti etk etn ets ett ia- iaa iab iae iai ian ias iat iba ibb ibe ibi ibk ibn ibs ibt ie- iea iee iei iek ien ies iet iia iib iie iii iin iis iit ika ikb ike iki ikk iks ikt in- ina inb ine ini ink inn ins int is- isa isb ise isi isk isn iss ist ita itb ite iti itk itn its itt k-t ka- kaa kab kae kai kak kan kas kat kba kbb kbe kbi kbk kbn kbs ke- kea keb kee kei kek ken kes ket kia kib kie kii kik kin kis kit kkb kke kki kkk kkn kks kkt kn- kna kne kni knk knn knt ksa ksb kse ksi ksk ksn kss kst kta ktb kte ktk ktn kts ktt n-i naa nab nae nai nak nan nas nat nba nbb nbe nbi nbk nbn nbs nbt ne- nea neb nee nei nek nen nes net nia nib nie nii nik nin nis nit nka nke nki nkk nkn nks nkt nna nnb nne nni nnk nnn nns nnt nsa nsb nse nsi nsk nsn nss nst nta ntb nte nti ntk ntn nts ntt saa sab sae sai sak san sas sat sba sbb sbe sbi sbk sbn sbs sbt se- sea seb see sei sek sen ses set sia sib sie sii sik sin sis sit sk- ska skb ske ski skk sks skt sna snb sne sni snk snn sns snt ss- ssa ssb sse ssi ssk ssn sss sst sta stb ste sti stk stn sts stt taa tab tae tai tak tan tas tat tba tbb tbe tbi tbk tbn tbs tbt te- tea teb tee tei tek ten tes tet tia tib tie tii tik tin tis tit tka tkb tke tkk tks tkt tna tnb tne tni tnk tnn tns tnt tsa tsb tse tsi tsk tsn tss tst tta ttb tte tti ttk ttn tts ttt