a-be aaaa aaab aaae aaaf aaba aabb aaea aafa aafb aaff aage aaoe aaoo abaa abab abae abaf abag abb- abba abbb abbe abbo abee abff aboa abob abof aboo aeaf aega afaa afao afee affa affo afgf afoa afoe afog afoo ag-o agag agao agba agbo agea agee agfa agga agge agob agog agoo aoba baaa baaf baba babb babe babo baff bafo baga bage bagg bago bbbb bbeb bbga beaf beag beba bebb bebe bebo beeb beef beeg befa befe beff befo bega begg bego beo- beof bfgf boab boag boba bobb bobe bobo boea boee boef boeo bofa bofe boff boga boge bogg bogo boob booe boof boog eaaf eaba eafb eaga eage ebba ebbo eboe eboo eeea eeee eefa eefe eega ef-g efab efeo effa egaa egae egao egba egbe egea egee eggb egge eggo ego- faaa faba fabe fabo faeb fafa fafe faff fafg fafo fage fagg fago feaf feba febo feeb fefe feff fefo fege fegg feof ffee ffff foaf foba fofo foge fogg fogo foof gaba gabb gabe gabo gaea gafa gafb gaff gaga gage gagg gago gbag gbbo geab geba gebe gefe gege gegg gego geo- geof geog gffa gfoa ggfg gggg goaf goba gobe gobo goef gofe goff goga gogo goof goog o-eo oafo obba obbo obea oboe oegb off- offa offe offo ofgo ogae ogb ogba ogbe ogea ogee ogge ogoa ogog ooaa ooba oobe ooff oooo