-ene -one bbbb bbeb bbox bcbc bccc bcec bebb bebe bebo beeb been bene benn beno beo- beon bnoc bobb bobe bobo boce boco boec boee boen boeo bonc bone bonn bono boob booc booe boon boox c-bo cbbc cbcc cbce cbcn cbec cbee cbox ccbc ccbn cccb cccc ccee ccnb ccnc ccne ccob ccoc cec- cece ceco ceeb ceec cen- cene ceno cexe cnbc cnco cnex cobb cobe cobo coce coco coen coex con- conc cone conn cono coob coon coxe cxxx ebbc ebbo ebcc eben ebno eboe ebon eboo ebox ecbc ecbe eccb eccc ecce ecco ecne eco- econ eeee eeoc enb- enbn ence enco enee eneo ennc enne eno- enoc enoe enon eone exco exec exen exo- exon nbbc nbbo nbcc nbco ncbc nccc nccn ncec ncee ncen ncnc ncoc nebb nebe nebn nebo necc nece neco neeb neen nene neno neo- neoc neon neoo neox nexe nexo nexx nnnn nobc nobo noce noco non- none nonn nono nonx noo- noob noon nooo o-eo obbo obec oben obex oboe obon obox ocbc occc occn oce ocee ocon oec- oecc oeec oen- oeno onc- once onco one- oneb onec onee oneo onex onne onno onon oobe oone oooo oxen oxo- oxon oxox oxxo xbee xbox xcon xen- xene xenn xeno xeon xexe xnee xobc xoco xoxo xxxo xxxx