-ey bbb bbc bbe bbn bby bcb bcc bce bcn bcy bcz be- beb bec bee ben bey bez bnb bnc bne bnn bnz by- byc bye byn byz bze bzn bzz c-- cbb cbc cbe cbn cby cbz ccb ccc cce ccn ccz ce- ceb cec cee cen cey cez cn- cnb cnc cne cnn cny cyb cyc cye cyn cz- czc cze ebb ebc ebe ebn eby ec- ecb ecc ece ecn eeb eec eee een eey en- enb enc ene enn eny enz eyc eye eyn eze ezz nbb nbc nbe nbn ncb ncc nce ncn ne- neb nec nee nen ney nez nnb nnc nne nnn nnz nyc nye nyn nyy nzb nze nzz ybc ybe yby ybz ycc yce ycy yeb yec yee yen yey yez yne ynn yny yyb yyc yye yyy yyz yzb yzy zbb zbc zby zce zeb zec zee zen zez znc zne znn zzy zzz