-ol bbb bbi bbk bbl bbo bbs bbt bi- bib bii bik bil bio bis bit bkb bkk bkl bko bks bkt blb bli blk bll blo bls blt bob boi bok bol boo bos bot bsb bsi bsk bsl bso bss bst btb bti btk btl bto bts btt ibb ibi ibk ibl ibo ibs ibt iib iii iil iio iis iit ikb iki ikk ikl iko iks ikt il- ilb ili ilk ill ilo ils ilt io- iob ioi iol ioo ios iot is- isb isi isk isl iso iss ist itb iti itk itl ito its itt k-t kbb kbi kbk kbl kbo kbs kib kii kik kil kio kis kit kkb kki kkk kkl kks kkt kl- klb kli klo kls klt kob koi kok kol koo kos kot ksb ksi ksk ksl kso kss kst ktb ktk ktl kto kts ktt lbb lbi lbk lbl lbo lbs lbt lib lii lik lil lio lis lit lkb lkl lks lkt llb lli llk lll llo lls llt lob loi lok lol loo los lot lsb lsi lsk lsl lso lss lst ltb lti ltk ltl lto lts ltt o-i ob- obb obi obk obl obo obs obt oib oii oik oil oio ois oit okb oki okk okl oko oks olb oli olk oll olo ols olt oo- oob ooi ook ool ooo oos oot os- osb osi osk osl oso oss ost ot- otb oti otk otl oto ots ott sbb sbi sbk sbl sbo sbs sbt sib sii sik sil sio sis sit sk- skb ski skk skl sko sks skt slb sli slk sll slo sls slt sob soi sok sol soo sos sot ss- ssb ssi ssk ssl sso sss sst stb sti stk stl sto sts stt tbb tbi tbk tbl tbo tbs tbt tib tii tik til tio tis tit tkb tkk tkl tko tks tkt tli tlk tll tlo tls tlt to- tob toi tok tol too tos tot tsb tsi tsk tsl tso tss tst ttb tti ttk ttl tto tts ttt