bbb bbi bbk bbn bbo bbs bbt bi- bib bii bik bin bio bis bit bkb bkk bkn bko bks bkt bnb bni bnk bnn bno bns bnt bob boi bok bon boo bos bot bsb bsi bsk bsn bso bss bst btb bti btk btn bto bts btt ibb ibi ibk ibn ibo ibs ibt iib iii iin iio iis iit ikb iki ikk iko iks ikt in- inb ini ink inn ino ins int io- iob ioi ion ioo ios iot is- isb isi isk isn iso iss ist itb iti itk itn ito its itt k-t kbb kbi kbk kbn kbo kbs kib kii kik kin kio kis kit kkb kki kkk kkn kks kkt kn- kni knk knn kno knt kob koi kok kon koo kos kot ksb ksi ksk ksn kso kss kst ktb ktk ktn kto kts ktt n-i nbb nbi nbk nbn nbo nbs nbt nib nii nik nin nio nis nit nki nkk nkn nko nks nkt nnb nni nnk nnn nno nns nnt no- nob noi nok non noo nos not nsb nsi nsk nsn nso nss nst ntb nti ntk ntn nto nts ntt o-i ob- obb obi obk obn obo obs obt oib oii oik oin oio ois oit okb oki okk oko oks on- onb oni onk onn ono ons ont oo- oob ooi ook oon ooo oos oot os- osb osi osk osn oso oss ost ot- otb oti otk otn oto ots ott sbb sbi sbk sbn sbo sbs sbt sib sii sik sin sio sis sit sk- skb ski skk sko sks skt snb sni snk snn sno sns snt sob soi sok son soo sos sot ss- ssb ssi ssk ssn sso sss sst stb sti stk stn sto sts stt tbb tbi tbk tbn tbo tbs tbt tib tii tik tin tio tis tit tkb tkk tko tks tkt tnb tni tnk tnn tno tns tnt to- tob toi tok ton too tos tot tsb tsi tsk tsn tso tss tst ttb tti ttk ttn tto tts ttt