-ol bbb bbi bbl bbo bbr bbt bi- bib bii bil bio bir bit blb bli bll blo blr blt bob boi bol boo bor bot brb bri brl bro brr brt btb bti btl bto btr btt ibb ibi ibl ibo ibr ibt iib iii iil iio iir iit il- ilb ili ill ilo ilr ilt io- iob ioi iol ioo ior iot ir- irb iri irl iro irr irt itb iti itl ito itt lbb lbi lbl lbo lbr lbt lib lii lil lio lir lit llb lli lll llo llr llt lob loi lol loo lor lot lrb lri lro lrr lrt ltb lti ltl lto ltr ltt o-i ob- obb obi obl obo obr obt oib oii oil oio oir oit olb oli oll olo olt oo- oob ooi ool ooo oor oot or- orb ori orl oro orr ort ot- otb oti otl oto otr ott rbb rbi rbl rbo rbr rbt rib rii ril rio rir rit rli rll rlo rlr rlt rob roi rol roo ror rot rrb rri rrl rrr rrt rtb rti rtl rto rtr rtt tbb tbi tbl tbo tbr tbt tib tii til tio tir tit tli tll tlo tlr tlt to- tob toi tol too tor tot trb tri trl tro trr trt ttb tti ttl tto ttr ttt