a-a a-b a-i a-t aaa aab aae aai aak aas aat ab- aba abb abe abi abk abs abt aea aeb aee aei aek aes aet ai- aia aib aie aii aik ais ait aka akb ake aki akk aks as- asa asb ase asi ask ass ast at- ata atb ate ati ats att baa bab bae bai bak bas bat bba bbb bbe bbi bbk bbs bbt be- bea beb bee bei bek bes bet bi- bia bib bie bii bik bis bit bka bkb bke bkk bks bkt bsa bsb bse bsi bsk bss bst bta btb bte bti btk bts btt eaa eab eae eai eak eas eat eba ebb ebe ebi ebk ebs ebt eea eeb eee eek ees eet eia eib eie eii eik eis eit eka ekb eke eki eks ekt es- esa esb ese esi esk ess est eta etb ete eti etk ets ett ia- iaa iab iae iai ias iat iba ibb ibe ibi ibk ibs ibt ie- iea iee iei iek ies iet iia iib iie iii iis iit ika ikb ike iki ikk iks ikt is- isa isb ise isi isk iss ist ita itb ite iti itk its itt k-t ka- kaa kab kae kai kak kas kat kba kbb kbe kbi kbk kbs ke- kea keb kee kei kek kes ket kia kib kie kii kik kis kit kkb kke kki kkk kks kkt ksa ksb kse ksi ksk kss kst kta ktb kte ktk kts ktt saa sab sae sai sak sas sat sba sbb sbe sbi sbk sbs sbt se- sea seb see sei sek ses set sia sib sie sii sik sis sit sk- ska skb ske ski skk sks skt ss- ssa ssb sse ssi ssk sss sst sta stb ste sti stk sts stt taa tab tae tai tak tas tat tba tbb tbe tbi tbk tbs tbt te- tea teb tee tei tek tes tet tia tib tie tii tik tis tit tka tkb tke tkk tks tkt tsa tsb tse tsi tsk tss tst tta ttb tte tti ttk tts ttt