a-a a-b a-i a-t aaa aab aae aaf aai aat ab- aba abb abe abf abi abt aea aeb aee aef aei aet af- afa afb afe aff afi aft ai- aia aib aie aif aii ait at- ata atb ate atf ati att baa bab bae baf bai bat bba bbb bbe bbf bbi bbt be- bea beb bee bef bei bet bfa bfb bfe bff bfi bft bi- bia bib bie bif bii bit bta btb bte btf bti btt eaa eab eae eaf eai eat eba ebb ebe ebf ebi ebt eea eeb eee eef eet ef- efa efb efe eff efi eft eia eib eie eif eii eit eta etb ete etf eti ett faa fab fae faf fai fat fba fbb fbe fbf fbi fbt fea feb fee fef fei fet ffa ffe fff ffi fft fia fib fie fif fii fit fta ftb fte ftf fti ftt i-f ia- iaa iab iae iaf iai iat iba ibb ibe ibf ibi ibt ie- iea iee ief iei iet ifa ifb ife iff ifi ift iia iib iie iif iii iit ita itb ite itf iti itt taa tab tae taf tai tat tba tbb tbe tbf tbi tbt te- tea teb tee tef tei tet tfa tfb tfe tff tfi tft tia tib tie tif tii tit tta ttb tte ttf tti ttt