-ol bbb bbe bbg bbl bbo bbt be- beb bee beg bel beo bet bgb bge bgg bgl bgo bgt blb ble blg bll blo blt bob boe bog bol boo bot btb bte btg btl bto btt ebb ebe ebg ebl ebo ebt eeb eee eeg eel eeo eet egb ege egg egl ego egt elb ele elg ell elo elt eo- eob eoe eog eol eoo eot etb ete etg etl eto ett gbe gbg gbl gbo gbt ge- geb gee geg gel geo get ggb ggg ggo ggt glb gle glg gll glo glt gob goe gog gol goo got gtb gte gtg gtl gto gtt lbb lbe lbg lbl lbo lbt leb lee leg lel leo let lgb lge lgg lgl lgo lgt llb lle llg lll llo llt lob loe log lol loo lot ltb lte ltg ltl lto ltt ob- obb obe obg obl obo obt oeb oee oeg oel oeo oet oge ogg ogl ogo ogt olb ole olg oll olo olt oo- oob oog ool ooo oot ot- otb ote otg otl oto ott tbb tbe tbg tbl tbo tbt te- teb tee teg tel teo tet tgb tge tgg tgl tgo tgt tle tlg tll tlo tlt to- tob toe tog tol too tot ttb tte ttg ttl tto ttt