-ol bbb bbg bbi bbl bbo bbs bbt bgb bgg bgi bgl bgo bgs bgt bi- bib big bii bil bio bis bit blb blg bli bll blo bls blt bob bog boi bol boo bos bot bsb bsg bsi bsl bso bss bst btb btg bti btl bto bts btt gbg gbi gbl gbo gbs gbt ggb ggg ggi ggo ggs ggt gib gig gii gil gio gis git glb glg gli gll glo gls glt gob gog goi gol goo gos got gsb gsg gsi gsl gso gss gst gtb gtg gti gtl gto gts gtt ibb ibg ibi ibl ibo ibs ibt igb igg igi igl igo igs igt iib iii iil iio iis iit il- ilb ilg ili ill ilo ils ilt io- iob iog ioi iol ioo ios iot is- isb isg isi isl iso iss ist itb itg iti itl ito its itt lbb lbg lbi lbl lbo lbs lbt lgb lgg lgi lgl lgo lgs lgt lib lig lii lil lio lis lit llb llg lli lll llo lls llt lob log loi lol loo los lot lsb lsg lsi lsl lso lss lst ltb ltg lti ltl lto lts ltt o-i ob- obb obg obi obl obo obs obt ogg ogi ogl ogo ogs ogt oib oii oil oio ois oit olb olg oli oll olo ols olt oo- oob oog ooi ool ooo oos oot os- osb osg osi osl oso oss ost ot- otb otg oti otl oto ots ott sbb sbg sbi sbl sbo sbs sbt sgb sgg sgi sgl sgo sgs sgt sib sig sii sil sio sis sit slb slg sli sll slo sls slt sob sog soi sol soo sos sot ss- ssb ssg ssi ssl sso sss sst stb stg sti stl sto sts stt tbb tbg tbi tbl tbo tbs tbt tgb tgg tgi tgl tgo tgs tgt tib tig tii til tio tis tit tlg tli tll tlo tls tlt to- tob tog toi tol too tos tot tsb tsg tsi tsl tso tss tst ttb ttg tti ttl tto tts ttt