-ol bbb bbc bbg bbk bbl bbn bbo bcb bcc bcg bck bcl bcn bco bgb bgc bgg bgk bgl bgn bgo bkb bkc bkg bkk bkl bkn bko blb blc blg blk bll bln blo bnb bnc bng bnk bnl bnn bno bob boc bog bok bol bon boo c-- cbb cbc cbg cbk cbl cbn cbo ccb ccc ccg cck ccl ccn cco cgb cgc cgg cgl cgn cgo ckb ckc cko cl- clb clc clg clk cll cln clo cn- cnb cnc cng cnl cnn cno co- cob coc cog cok col con coo gbc gbg gbk gbl gbn gbo gcb gcc gcg gck gcl gcn gco ggb ggc ggg ggn ggo gkb gkn gko glb glc glg glk gll gln glo gnb gnc gnl gnn gno gob goc gog gok gol gon goo kbb kbc kbk kbl kbn kbo kcb kcc kcg kck kcl kcn kgb kgc kgl kgo kkb kkc kkk kkl kkn kl- klb klc klg klo kn- knc kng knk knl knn kno kob koc kog kok kol kon koo lbb lbc lbg lbk lbl lbo lcb lcc lcg lck lcl lcn lco lgb lgc lgg lgk lgl lgn lgo lkb lkg lkl llb llc llg llk lll lln llo lnb lnc lng lnk lnl lnn lno lob loc log lok lol lon loo nbb nbc nbg nbk nbl nbn nbo ncb ncc ncg nck ncl ncn nco ngb ngc ngg ngk ngl ngn ngo nkc nkk nkn nko nlb nlc nlg nlk nll nln nlo nnb nnc nng nnk nnl nnn nno no- nob noc nog nok nol non noo ob- obb obc obg obk obl obn obo oc- ocb occ ocg ock ocl ocn oco ogc ogg ogl ogn ogo okb okc okg okk okl oko olb olc olg olk oll oln olo on- onb onc ong onk onl onn ono oo- oob ooc oog ook ool oon ooo