a-ha aaaa aaab aaac aaaf aaah aaal aaba aabb aabc aabh aabl aaca aacb aacc aacf aach aacl aafa aafb aafc aaff aafl aaha aahl aala aalc aall abaa abab abac abaf abal abb- abba abbb abca abcb abcc abcf abch abcl abff abha abla acaa acab acac acba acbl acca accc accf acch acfc acfl acha achh achl acla aclc afaa afca afcb afcc afch affa affc afla aflc ahab ahac ahah ahal ahfa ahha ahla alaa alac alal alb- alba albc alca alcc alfa alha all- alla allh alll baaa baaf baah baal baba babb bac- baca bacc bach bafc baff baha bahl bala balc balf ball bbbb bbch bbfc bblb bcaa bcbc bcca bccc bccl bcfc bfca bffl bhca bhcc bhff blaa blab blac blah blfc caaa caab caac caaf caah caal caba cabf cac- caca cacc cach cafa cafb cafc caff cafl caha cahl cala calc calf call cbac cbal cbbc cbca cbcc cbcl cbfb cbfc cbha cbhl cblb cblc ccaa ccab ccac ccaf ccba ccbc ccca cccb cccc cccf cccl ccfa ccfc ccff ccfl ccha cchl ccla cclc cfaa cfab cfac cfbc cfca cfcb cfcf cfcl cffb chaa chab chac chaf chah chal chca chch chfa chfc chha chlc clab claf faaa faac faah faba faca facc fach fafa fafc faff faha fala falc fall fbla fcab fcal fcba fcca fccf fcch ffcc ffff fhlb flab flac flcl haab haaf haal haba hafb haff haha hal- hala halb half hall hbfc hcbc hcca hccb hccc hcch hcfa hcfc hfba hhaa hhcl hhhh hhla hlah laaa laac laal laba laca lacc lach lacl lafb lafc laff laha lala lall lbcc lcac lcbc lcca lccc lcfc lchc lfca lfcc lhhh llcc lllc llll