bbb bbe bbi bbk bbn bbo bbs bbt be- beb bee bei bek ben beo bes bet bi- bib bie bii bik bin bio bis bit bkb bke bkk bkn bko bks bkt bnb bne bni bnk bnn bno bns bnt bob boe boi bok bon boo bos bot bsb bse bsi bsk bsn bso bss bst btb bte bti btk btn bto bts btt ebb ebe ebi ebk ebn ebo ebs ebt eeb eee eek een eeo ees eet eib eie eii eik ein eio eis eit ekb eke eki eko eks ekt en- enb ene eni enk enn eno ens ent eo- eob eoe eoi eok eon eoo eos eot es- esb ese esi esk esn eso ess est etb ete eti etk etn eto ets ett ibb ibe ibi ibk ibn ibo ibs ibt ie- iee iei iek ien ies iet iib iie iii iin iio iis iit ikb ike iki ikk iko iks ikt in- inb ine ini ink inn ino ins int io- iob ioe ioi ion ioo ios iot is- isb ise isi isk isn iso iss ist itb ite iti itk itn ito its itt k-t kbb kbe kbi kbk kbn kbo kbs ke- keb kee kei kek ken keo kes ket kib kie kii kik kin kio kis kit kkb kke kki kkk kkn kks kkt kn- kne kni knk knn kno knt kob koe koi kok kon koo kos kot ksb kse ksi ksk ksn kso kss kst ktb kte ktk ktn kto kts ktt n-i nbb nbe nbi nbk nbn nbo nbs nbt ne- neb nee nei nek nen neo nes net nib nie nii nik nin nio nis nit nke nki nkk nkn nko nks nkt nnb nne nni nnk nnn nno nns nnt no- nob noe noi nok non noo nos not nsb nse nsi nsk nsn nso nss nst ntb nte nti ntk ntn nto nts ntt o-i ob- obb obe obi obk obn obo obs obt oeb oee oei oen oeo oes oet oib oie oii oik oin oio ois oit okb oke oki okk oko oks on- onb one oni onk onn ono ons ont oo- oob ooi ook oon ooo oos oot os- osb ose osi osk osn oso oss ost ot- otb ote oti otk otn oto ots ott sbb sbe sbi sbk sbn sbo sbs sbt se- seb see sei sek sen seo ses set sib sie sii sik sin sio sis sit sk- skb ske ski skk sko sks skt snb sne sni snk snn sno sns snt sob soe soi sok son soo sos sot ss- ssb sse ssi ssk ssn sso sss sst stb ste sti stk stn sto sts stt tbb tbe tbi tbk tbn tbo tbs tbt te- teb tee tei tek ten teo tes tet tib tie tii tik tin tio tis tit tkb tke tkk tko tks tkt tnb tne tni tnk tnn tno tns tnt to- tob toe toi tok ton too tos tot tsb tse tsi tsk tsn tso tss tst ttb tte tti ttk ttn tto tts ttt