-ey bbb bbe bbi bbk bbt bby be- beb bee bei bek bet bey bi- bib bie bii bik bit biy bkb bke bkk bkt btb bte bti btk btt bty by- bye byi byk byt ebb ebe ebi ebk ebt eby eeb eee eek eet eey eib eie eii eik eit ekb eke eki ekt eky etb ete eti etk ett ety eye eyt ibb ibe ibi ibk ibt iby ie- iee iei iek iet iey iib iie iii iit ikb ike iki ikk ikt itb ite iti itk itt ity iye iyt iyy k-t kbb kbe kbi kbk ke- keb kee kei kek ket key kib kie kii kik kit kkb kke kki kkk kkt kky ktb kte ktk ktt kye kyt tbb tbe tbi tbk tbt te- teb tee tei tek tet tey tib tie tii tik tit tiy tkb tke tkk tkt tky ttb tte tti ttk ttt tty tye tyt ybe ybi yby yeb yee yei yek yet yey yie yii yit yki ykk yte ytk ytt yyb yye yyt yyy