-ol bbb bbi bbk bbl bbo bbr bbt bi- bib bii bik bil bio bir bit bkb bkk bkl bko bkr bkt blb bli blk bll blo blr blt bob boi bok bol boo bor bot brb bri brk brl bro brr brt btb bti btk btl bto btr btt ibb ibi ibk ibl ibo ibr ibt iib iii iil iio iir iit ikb iki ikk ikl iko ikr ikt il- ilb ili ilk ill ilo ilr ilt io- iob ioi iol ioo ior iot ir- irb iri irk irl iro irr irt itb iti itk itl ito itt k-t kbb kbi kbk kbl kbo kbr kib kii kik kil kio kir kit kkb kki kkk kkl kkr kkt kl- klb kli klo klr klt kob koi kok kol koo kor kot kri krk krl kro krr krt ktb ktk ktl kto ktr ktt lbb lbi lbk lbl lbo lbr lbt lib lii lik lil lio lir lit lkb lkl lkr lkt llb lli llk lll llo llr llt lob loi lok lol loo lor lot lrb lri lrk lro lrr lrt ltb lti ltk ltl lto ltr ltt o-i ob- obb obi obk obl obo obr obt oib oii oik oil oio oir oit okb oki okk okl oko okr olb oli olk oll olo olt oo- oob ooi ook ool ooo oor oot or- orb ori ork orl oro orr ort ot- otb oti otk otl oto otr ott rbb rbi rbk rbl rbo rbr rbt rib rii rik ril rio rir rit rkb rkk rko rkt rli rll rlo rlr rlt rob roi rok rol roo ror rot rrb rri rrk rrl rrr rrt rtb rti rtk rtl rto rtr rtt tbb tbi tbk tbl tbo tbr tbt tib tii tik til tio tir tit tkb tkk tkl tko tkr tkt tli tlk tll tlo tlr tlt to- tob toi tok tol too tor tot trb tri trk trl tro trr trt ttb tti ttk ttl tto ttr ttt