a-a a-b a-i a-t aaa aab aae aai aak aat ab- aba abb abe abi abk abt aea aeb aee aei aek aet ai- aia aib aie aii aik ait aka akb ake aki akk at- ata atb ate ati att baa bab bae bai bak bat bba bbb bbe bbi bbk bbt be- bea beb bee bei bek bet bi- bia bib bie bii bik bit bka bkb bke bkk bkt bta btb bte bti btk btt eaa eab eae eai eak eat eba ebb ebe ebi ebk ebt eea eeb eee eek eet eia eib eie eii eik eit eka ekb eke eki ekt eta etb ete eti etk ett ia- iaa iab iae iai iat iba ibb ibe ibi ibk ibt ie- iea iee iei iek iet iia iib iie iii iit ika ikb ike iki ikk ikt ita itb ite iti itk itt k-t ka- kaa kab kae kai kak kat kba kbb kbe kbi kbk ke- kea keb kee kei kek ket kia kib kie kii kik kit kkb kke kki kkk kkt kta ktb kte ktk ktt taa tab tae tai tak tat tba tbb tbe tbi tbk tbt te- tea teb tee tei tek tet tia tib tie tii tik tit tka tkb tke tkk tkt tta ttb tte tti ttk ttt