-ey bbb bbc bbe bbn bbs bby bcb bcc bce bcn bcs bcy be- beb bec bee ben bes bey bnb bnc bne bnn bns bsb bsc bse bsn bss bsy by- byc bye byn bys c-- cbb cbc cbe cbn cbs cby ccb ccc cce ccn ccs ce- ceb cec cee cen ces cey cn- cnb cnc cne cnn cns cny csb csc cse csn css csy cyb cyc cye cyn cys ebb ebc ebe ebn ebs eby ec- ecb ecc ece ecn ecs eeb eec eee een ees eey en- enb enc ene enn ens eny es- esb esc ese esn ess esy eyc eye eyn eys nbb nbc nbe nbn nbs ncb ncc nce ncn ncs ne- neb nec nee nen nes ney nnb nnc nne nnn nns nsb nsc nse nsn nss nsy nyc nye nyn nys nyy sbb sbc sbe sbn sbs sby scb scc sce scn scs se- seb sec see sen ses sey snb snc sne snn sns sny ss- ssb ssc sse ssn sss sy- syb syc sye syn sys ybc ybe ybs yby ycc yce ycs ycy yeb yec yee yen yes yey yne ynn yns yny ysb ysc yse yss ysy yyb yyc yye yys yyy