-ey bbb bbc bbe bbn bbo bby bcb bcc bce bcn bco bcy be- beb bec bee ben beo bey bnb bnc bne bnn bno bob boc boe bon boo boy by- byc bye byn byo c-- cbb cbc cbe cbn cbo cby ccb ccc cce ccn cco ce- ceb cec cee cen ceo cey cn- cnb cnc cne cnn cno cny co- cob coc coe con coo coy cyb cyc cye cyn cyo ebb ebc ebe ebn ebo eby ec- ecb ecc ece ecn eco eeb eec eee een eeo eey en- enb enc ene enn eno eny eo- eob eoc eoe eon eoo eyc eye eyn eyo nbb nbc nbe nbn nbo ncb ncc nce ncn nco ne- neb nec nee nen neo ney nnb nnc nne nnn nno no- nob noc noe non noo noy nyc nye nyn nyo nyy ob- obb obc obe obn obo oby oc- ocb occ ocn oco oeb oec oee oen oeo oey on- onb onc one onn ono ony oo- oob ooc oon ooo oye oyo ybc ybe yby ycc yce yco ycy yeb yec yee yen yeo yey yne ynn yny yob yoc yoe yon yoo yoy yyb yyc yye yyy