a-be a-ha aaaa aaab aaac aaae aaaf aaah aaba aabb aabc aabh aaca aacb aacc aace aacf aach aaco aaea aaec aafa aafb aafc aaff aaha aaoe aaoo abaa abab abac abae abaf abb- abba abbb abbe abbo abca abcb abcc abcf abch abec abee abff abha abho aboa abob abof aboh aboo acaa acab acac acae acba acca accc acce accf acch acco ace- acea acec aceh acfc acfe acha ache achh acho acoa acoe acoh aeac aeaf aecb afaa afao afca afcb afcc afch afee affa affc affo afoa afoe afoo ahab ahac ahah ahfa ahha ahoa ahoe aoah aoba aoca aoce baaa baaf baah baba babb babe babo bac- baca bacc bace bach baco bafc baff bafo baha baho baoh bbbb bbch bbeb bbfc bcaa bcbc bcca bccc bcec bcfc bche bcof beaf beah beba bebb bebe bebo beca bech beeb beef befa befe beff befo beo- beof bfca bhao bhca bhcc bhff boab boac boba bobb bobe bobo boca boce boch boco boea boec boee boef boeo bofa bofe boff bofh boha boho boob booc booe boof booh c-bo caaa caab caac caaf caah caba cabe cabf cabo cac- caca cacc cace cach caco caec cafa cafb cafc cafe caff caha cahe cbac cbbc cbca cbcc cbce cbea cbec cbee cbef cbfb cbfc cbha ccaa ccab ccac ccaf ccba ccbc ccca cccb cccc cccf ccee ccfa ccfc ccff ccha cche ccob ccoc ceac ceba cec- ceca cece ceco ceeb ceec cef- cefa cefc cfaa cfab cfac cfae cfao cfbc cfca cfcb cfcf cfco cffb cfoa chaa chab chac chae chaf chah chao chca chce chch chea cheb chec chee chef cheh chfa chfc chha choc choh choo coba cobb cobe cobh cobo coca coce coch coco cofc cofe coff coha coho coob coof cooh eaaf eaba eabh eaca eacc each eaec eafb ebac ebba ebbc ebbo ebcc ebfc eboe eboo ecaa ecac ecao ecbc ecbe ecca eccb eccc ecce ecco ecef ecfa ecfc echa eche echo eco- eeca eeea eeee eefa eefe eeoc efab efca efco efeo effa ehaa ehcc ehea eheh faaa faac faah faba fabe fabo faca facc face fach faeb fafa fafc fafe faff fafo faha fcab fcba fcca fccf fcch feaf feba febo fece fech feeb fefc fefe feff fefo feof feoh ffcc ffee ffff foaf foba foca foce foch foco fofo foof haab haaf haba habe habo hace haco haec hafb hafe haff haha haho hbfc hboc hcbc hcca hccb hccc hcch hcfa hcfc heaf heah hebb hebe hebo heca hech heeb heef hefe hehe heho hfba hfce hhaa hhhh hhof hoac hoba hobe hobo hoca hoce hoch hofe hoff hoha hohe hoho hooe hoof o-eo oafc oafo oahe obba obbo obea obec oboe ocab ocac ocbc occa occc oce ocee ocef ocfa ocha oche oec- oeca oecc oeec ofah off- offa offc offe offh offo ohba ohbe ohcc ohee ohho ohob ohoh ooaa ooba oobe ooff ooha ooho oooh oooo