-ol bbb bbi bbk bbl bbo bbt bi- bib bii bik bil bio bit bkb bkk bkl bko bkt blb bli blk bll blo blt bob boi bok bol boo bot btb bti btk btl bto btt ibb ibi ibk ibl ibo ibt iib iii iil iio iit ikb iki ikk ikl iko ikt il- ilb ili ilk ill ilo ilt io- iob ioi iol ioo iot itb iti itk itl ito itt k-t kbb kbi kbk kbl kbo kib kii kik kil kio kit kkb kki kkk kkl kkt kl- klb kli klo klt kob koi kok kol koo kot ktb ktk ktl kto ktt lbb lbi lbk lbl lbo lbt lib lii lik lil lio lit lkb lkl lkt llb lli llk lll llo llt lob loi lok lol loo lot ltb lti ltk ltl lto ltt o-i ob- obb obi obk obl obo obt oib oii oik oil oio oit okb oki okk okl oko olb oli olk oll olo olt oo- oob ooi ook ool ooo oot ot- otb oti otk otl oto ott tbb tbi tbk tbl tbo tbt tib tii tik til tio tit tkb tkk tkl tko tkt tli tlk tll tlo tlt to- tob toi tok tol too tot ttb tti ttk ttl tto ttt