-ol bbb bbi bbk bbl bbn bbo bbs bbt bi- bib bii bik bil bin bio bis bit bkb bkk bkl bkn bko bks bkt blb bli blk bll bln blo bls blt bnb bni bnk bnl bnn bno bns bnt bob boi bok bol bon boo bos bot bsb bsi bsk bsl bsn bso bss bst btb bti btk btl btn bto bts btt ibb ibi ibk ibl ibn ibo ibs ibt iib iii iil iin iio iis iit ikb iki ikk ikl iko iks ikt il- ilb ili ilk ill iln ilo ils ilt in- inb ini ink inl inn ino ins int io- iob ioi iol ion ioo ios iot is- isb isi isk isl isn iso iss ist itb iti itk itl itn ito its itt k-t kbb kbi kbk kbl kbn kbo kbs kib kii kik kil kin kio kis kit kkb kki kkk kkl kkn kks kkt kl- klb kli klo kls klt kn- kni knk knl knn kno knt kob koi kok kol kon koo kos kot ksb ksi ksk ksl ksn kso kss kst ktb ktk ktl ktn kto kts ktt lbb lbi lbk lbl lbo lbs lbt lib lii lik lil lin lio lis lit lkb lkl lks lkt llb lli llk lll lln llo lls llt lnb lni lnk lnl lnn lno lns lnt lob loi lok lol lon loo los lot lsb lsi lsk lsl lsn lso lss lst ltb lti ltk ltl lto lts ltt n-i nbb nbi nbk nbl nbn nbo nbs nbt nib nii nik nil nin nio nis nit nki nkk nkn nko nks nkt nlb nli nlk nll nln nlo nls nlt nnb nni nnk nnl nnn nno nns nnt no- nob noi nok nol non noo nos not nsb nsi nsk nsl nsn nso nss nst ntb nti ntk ntn nto nts ntt o-i ob- obb obi obk obl obn obo obs obt oib oii oik oil oin oio ois oit okb oki okk okl oko oks olb oli olk oll oln olo ols olt on- onb oni onk onl onn ono ons ont oo- oob ooi ook ool oon ooo oos oot os- osb osi osk osl osn oso oss ost ot- otb oti otk otl otn oto ots ott sbb sbi sbk sbl sbn sbo sbs sbt sib sii sik sil sin sio sis sit sk- skb ski skk skl sko sks skt slb sli slk sll sln slo sls slt snb sni snk snl snn sno sns snt sob soi sok sol son soo sos sot ss- ssb ssi ssk ssl ssn sso sss sst stb sti stk stl stn sto sts stt tbb tbi tbk tbl tbn tbo tbs tbt tib tii tik til tin tio tis tit tkb tkk tkl tko tks tkt tli tlk tll tln tlo tls tlt tnb tni tnk tnl tnn tno tns tnt to- tob toi tok tol ton too tos tot tsb tsi tsk tsl tsn tso tss tst ttb tti ttk ttl ttn tto tts ttt