a-a a-b a-i a-t aaa aab aae aaf aai aak aat ab- aba abb abe abf abi abk abt aea aeb aee aef aei aek aet af- afa afb afe aff afi afk aft ai- aia aib aie aif aii aik ait aka akb ake aki akk at- ata atb ate atf ati att baa bab bae baf bai bak bat bba bbb bbe bbf bbi bbk bbt be- bea beb bee bef bei bek bet bfa bfb bfe bff bfi bft bi- bia bib bie bif bii bik bit bka bkb bke bkf bkk bkt bta btb bte btf bti btk btt eaa eab eae eaf eai eak eat eba ebb ebe ebf ebi ebk ebt eea eeb eee eef eek eet ef- efa efb efe eff efi eft eia eib eie eif eii eik eit eka ekb eke ekf eki ekt eta etb ete etf eti etk ett faa fab fae faf fai fak fat fba fbb fbe fbf fbi fbk fbt fea feb fee fef fei fek fet ffa ffe fff ffi ffk fft fia fib fie fif fii fik fit fka fkb fkf fki fkk fkt fta ftb fte ftf fti ftk ftt i-f ia- iaa iab iae iaf iai iat iba ibb ibe ibf ibi ibk ibt ie- iea iee ief iei iek iet ifa ifb ife iff ifi ift iia iib iie iif iii iit ika ikb ike ikf iki ikk ikt ita itb ite itf iti itk itt k-t ka- kaa kab kae kaf kai kak kat kba kbb kbe kbf kbi kbk ke- kea keb kee kef kei kek ket kfa kff kfi kia kib kie kif kii kik kit kkb kke kki kkk kkt kta ktb kte ktf ktk ktt taa tab tae taf tai tak tat tba tbb tbe tbf tbi tbk tbt te- tea teb tee tef tei tek tet tfa tfb tfe tff tfi tfk tft tia tib tie tif tii tik tit tka tkb tke tkk tkt tta ttb tte ttf tti ttk ttt