aaaa aaab aaac aaal aaba aabb aabc aabl aaca aacb aacc aacl aacu aala aalc aall aalu abaa abab abac abal abau abb- abba abbb abca abcb abcc abcl abla abua abul acaa acab acac acba acbl acca accc accu acla aclc aclu acu- acul alaa alac alal alau alb- alba albc albu alca alcc all- alla alll allu alua auaa auca aul- aula aull aulu baaa baal baba babb babu bac- baca bacc bala balc ball balu bau- baul bbau bbbb bblb bcaa bcbc bcca bccc bccl bcuc blaa blab blac blau blcu blub bual buba bubb bubu buca bucc bucu bula bulb bull bulu caaa caab caac caal caba cabu cac- caca cacc cala calc call calu cauc caul cbac cbal cbbc cbca cbcc cbcl cbcu cblb cblc ccaa ccab ccac ccba ccbc ccca cccb cccc cccl cccu ccla cclc ccuc clab clau club cuau cub- cuba cubb cuca cucc cula culb culc cull laaa laac laal laba labu laca lacc lacl lacu lala lall lalu laub laul lbcc lcac lcbc lcca lccc llcc lllc llll luau luba luca lula lull lulu luua uabc uaca uaua ubac ubal ubba ubla ucal ucbc ucca ucla ucua ulaa ulbc ulcc ulla ulua ulul uulu uuuu