-ol bbb bbg bbi bbl bbo bbr bbs bbt bgb bgg bgi bgl bgo bgr bgs bgt bi- bib big bii bil bio bir bis bit blb blg bli bll blo blr bls blt bob bog boi bol boo bor bos bot brb brg bri brl bro brr brs brt bsb bsg bsi bsl bso bsr bss bst btb btg bti btl bto btr bts btt gbg gbi gbl gbo gbr gbs gbt ggb ggg ggi ggo ggr ggs ggt gib gig gii gil gio gir gis git glb glg gli gll glo glr gls glt gob gog goi gol goo gor gos got grb grg gri grl gro grr grs grt gsb gsg gsi gsl gso gsr gss gst gtb gtg gti gtl gto gtr gts gtt ibb ibg ibi ibl ibo ibr ibs ibt igb igg igi igl igo igr igs igt iib iii iil iio iir iis iit il- ilb ilg ili ill ilo ilr ils ilt io- iob iog ioi iol ioo ior ios iot ir- irb irg iri irl iro irr irs irt is- isb isg isi isl iso isr iss ist itb itg iti itl ito its itt lbb lbg lbi lbl lbo lbr lbs lbt lgb lgg lgi lgl lgo lgr lgs lgt lib lig lii lil lio lir lis lit llb llg lli lll llo llr lls llt lob log loi lol loo lor los lot lrb lrg lri lro lrr lrs lrt lsb lsg lsi lsl lso lsr lss lst ltb ltg lti ltl lto ltr lts ltt o-i ob- obb obg obi obl obo obr obs obt ogg ogi ogl ogo ogs ogt oib oii oil oio oir ois oit olb olg oli oll olo ols olt oo- oob oog ooi ool ooo oor oos oot or- orb org ori orl oro orr ors ort os- osb osg osi osl oso osr oss ost ot- otb otg oti otl oto otr ots ott rbb rbg rbi rbl rbo rbr rbs rbt rgb rgg rgi rgo rgr rgs rgt rib rig rii ril rio rir ris rit rlg rli rll rlo rlr rls rlt rob rog roi rol roo ror ros rot rrb rrg rri rrl rrr rrs rrt rsb rsg rsi rsl rso rsr rss rst rtb rtg rti rtl rto rtr rts rtt sbb sbg sbi sbl sbo sbr sbs sbt sgb sgg sgi sgl sgo sgr sgs sgt sib sig sii sil sio sir sis sit slb slg sli sll slo slr sls slt sob sog soi sol soo sor sos sot sr- srb srg sri srl sro srr srs srt ss- ssb ssg ssi ssl sso ssr sss sst stb stg sti stl sto str sts stt tbb tbg tbi tbl tbo tbr tbs tbt tgb tgg tgi tgl tgo tgr tgs tgt tib tig tii til tio tir tis tit tlg tli tll tlo tlr tls tlt to- tob tog toi tol too tor tos tot trb trg tri trl tro trr trs trt tsb tsg tsi tsl tso tsr tss tst ttb ttg tti ttl tto ttr tts ttt