-ol bbb bbi bbl bbo bbr bbt bi- bib bii bil bio bir bit biz blb bli bll blo blr blt blz bob boi bol boo bor bot boz brb bri brl bro brr brt brz btb bti btl bto btr btt btz bzo bzr bzz ibb ibi ibl ibo ibr ibt ibz iib iii iil iio iir iit il- ilb ili ill ilo ilr ilt ilz io- iob ioi iol ioo ior iot ir- irb iri irl iro irr irt itb iti itl ito itt itz izi izo izz lbb lbi lbl lbo lbr lbt lib lii lil lio lir lit liz llb lli lll llo llr llt llz lob loi lol loo lor lot loz lrb lri lro lrr lrt lrz ltb lti ltl lto ltr ltt ltz lzi lzo lzr o-i ob- obb obi obl obo obr obt oib oii oil oio oir oit oiz olb oli oll olo olt oo- oob ooi ool ooo oor oot or- orb ori orl oro orr ort orz ot- otb oti otl oto otr ott otz ozo ozt ozz rbb rbi rbl rbo rbr rbt rib rii ril rio rir rit riz rli rll rlo rlr rlt rob roi rol roo ror rot roz rrb rri rrl rrr rrt rtb rti rtl rto rtr rtt rtz rzb rzo tbb tbi tbl tbo tbr tbt tbz tib tii til tio tir tit tiz tli tll tlo tlr tlt tlz to- tob toi tol too tor tot toz trb tri trl tro trr trt trz ttb tti ttl tto ttr ttt zbb zbl zbr zbt zib zil zio zir zit ziz zlr zlt zo- zob zoi zol zoo zor zot zrl zro ztl ztr zzr zzt zzz