-ol bbb bbc bbe bbg bbk bbl bbo bcb bcc bce bcg bck bcl bco be- beb bec bee beg bek bel beo bgb bgc bge bgg bgk bgl bgo bkb bkc bke bkg bkk bkl bko blb blc ble blg blk bll blo bob boc boe bog bok bol boo c-- cbb cbc cbe cbg cbk cbl cbo ccb ccc cce ccg cck ccl cco ce- ceb cec cee ceg cek cel ceo cgb cgc cge cgg cgl cgo ckb ckc cko cl- clb clc cle clg clk cll clo co- cob coc coe cog cok col coo ebb ebc ebe ebg ebk ebl ebo ec- ecb ecc ece ecg eck ecl eco eeb eec eee eeg eek eel eeo egb egc ege egg egl ego ekb ekc eke ekg ekl eko elb elc ele elg elk ell elo eo- eob eoc eoe eog eok eol eoo gbc gbe gbg gbk gbl gbo gcb gcc gce gcg gck gcl gco ge- geb gec gee geg gek gel geo ggb ggc ggg ggo gkb gko glb glc gle glg glk gll glo gob goc goe gog gok gol goo kbb kbc kbe kbk kbl kbo kcb kcc kce kcg kck kcl ke- keb kec kee keg kek kel keo kgb kgc kgl kgo kkb kkc kke kkk kkl kl- klb klc klg klo kob koc koe kog kok kol koo lbb lbc lbe lbg lbk lbl lbo lcb lcc lce lcg lck lcl lco leb lec lee leg lek lel leo lgb lgc lge lgg lgk lgl lgo lkb lkg lkl llb llc lle llg llk lll llo lob loc loe log lok lol loo ob- obb obc obe obg obk obl obo oc- ocb occ ocg ock ocl oco oeb oec oee oeg oel oeo ogc oge ogg ogl ogo okb okc oke okg okk okl oko olb olc ole olg olk oll olo oo- oob ooc oog ook ool ooo