-ey bbb bbc bbe bbk bbn bbo bby bcb bcc bce bck bcn bco bcy be- beb bec bee bek ben beo bey bkb bkc bke bkk bkn bko bnb bnc bne bnk bnn bno bob boc boe bok bon boo boy by- byc bye byk byn byo c-- cbb cbc cbe cbk cbn cbo cby ccb ccc cce cck ccn cco ce- ceb cec cee cek cen ceo cey ckb ckc cko cky cn- cnb cnc cne cnn cno cny co- cob coc coe cok con coo coy cyb cyc cye cyk cyn cyo ebb ebc ebe ebk ebn ebo eby ec- ecb ecc ece eck ecn eco eeb eec eee eek een eeo eey ekb ekc eke eko eky en- enb enc ene enk enn eno eny eo- eob eoc eoe eok eon eoo eyc eye eyn eyo kbb kbc kbe kbk kbn kbo kcb kcc kce kck kcn ke- keb kec kee kek ken keo key kkb kkc kke kkk kkn kky kn- knc kne knk knn kno kob koc koe kok kon koo koy kyc kye kyn kyo nbb nbc nbe nbk nbn nbo ncb ncc nce nck ncn nco ne- neb nec nee nek nen neo ney nkc nke nkk nkn nko nky nnb nnc nne nnk nnn nno no- nob noc noe nok non noo noy nyc nye nyk nyn nyo nyy ob- obb obc obe obk obn obo oby oc- ocb occ ock ocn oco oeb oec oee oen oeo oey okb okc oke okk oko on- onb onc one onk onn ono ony oo- oob ooc ook oon ooo oye oyo ybc ybe yby ycc yce yco ycy yeb yec yee yek yen yeo yey ykk ykn yne ynk ynn yny yob yoc yoe yok yon yoo yoy yyb yyc yye yyy