-ey bbb bbe bbk bbn bbo bbs bbt bby be- beb bee bek ben beo bes bet bey bkb bke bkk bkn bko bks bkt bnb bne bnk bnn bno bns bnt bob boe bok bon boo bos bot boy bsb bse bsk bsn bso bss bst bsy btb bte btk btn bto bts btt bty by- bye byk byn byo bys byt ebb ebe ebk ebn ebo ebs ebt eby eeb eee eek een eeo ees eet eey ekb eke eko eks ekt eky en- enb ene enk enn eno ens ent eny eo- eob eoe eok eon eoo eos eot es- esb ese esk esn eso ess est esy etb ete etk etn eto ets ett ety eye eyn eyo eys eyt k-t kbb kbe kbk kbn kbo kbs ke- keb kee kek ken keo kes ket key kkb kke kkk kkn kks kkt kky kn- kne knk knn kno knt kob koe kok kon koo kos kot koy ksb kse ksk ksn kso kss kst ktb kte ktk ktn kto kts ktt kye kyn kyo kys kyt nbb nbe nbk nbn nbo nbs nbt ne- neb nee nek nen neo nes net ney nke nkk nkn nko nks nkt nky nnb nne nnk nnn nno nns nnt no- nob noe nok non noo nos not noy nsb nse nsk nsn nso nss nst nsy ntb nte ntk ntn nto nts ntt nye nyk nyn nyo nys nyt nyy ob- obb obe obk obn obo obs obt oby oeb oee oen oeo oes oet oey okb oke okk oko oks on- onb one onk onn ono ons ont ony oo- oob ook oon ooo oos oot os- osb ose osk osn oso oss ost ot- otb ote otk otn oto ots ott oye oyo oys sbb sbe sbk sbn sbo sbs sbt sby se- seb see sek sen seo ses set sey sk- skb ske skk sko sks skt sky snb sne snk snn sno sns snt sny sob soe sok son soo sos sot soy ss- ssb sse ssk ssn sso sss sst stb ste stk stn sto sts stt sty sy- syb sye syk syn sys syt tbb tbe tbk tbn tbo tbs tbt te- teb tee tek ten teo tes tet tey tkb tke tkk tko tks tkt tky tnb tne tnk tnn tno tns tnt to- tob toe tok ton too tos tot toy tsb tse tsk tsn tso tss tst tsy ttb tte ttk ttn tto tts ttt tty tye tyn tyo tys tyt ybe ybs yby yeb yee yek yen yeo yes yet yey ykk ykn yne ynk ynn yns yny yob yoe yok yon yoo yos yot yoy ysb yse ysk yso yss yst ysy yte ytk ytn yto yts ytt yyb yye yys yyt yyy