aaaa aaab aaac aaal aaba aabb aabc aabl aaca aacb aacc aacl aaco aacu aala aalc aall aalo aalu aaoo abaa abab abac abal abau abb- abba abbb abbo abca abcb abcc abcl abla ablo aboa abob abol aboo abou abua abul acaa acab acac acba acbl acca accc acco accu acla aclc aclu acoa acol acou acu- acul acuo alaa alac alal alao alau alb- alba albc albo albu alca alcc alco all- alla alll allo allu aloa aloc alol aloo alou alua aoba aoca aola aoul auaa auca aul- aula aull aulo aulu auol baaa baal baba babb babo babu bac- baca bacc baco bala balc ball balo balu baol bau- baul bbau bbbb bblb bcaa bcbc bcca bccc bccl bcuc blaa blab blac blau blcu blob bloc bloo blou blub boab boac boal boba bobb bobo bobu boca boco bocu bola boll bolo bolu boob booc bool boua boul bual buba bubb bubo bubu buca bucc buco bucu bula bulb bull bulu buol c-bo caaa caab caac caal caba cabo cabu cac- caca cacc caco cala calc call calo calu caol cauc caul cauo cbac cbal cbbc cbca cbcc cbcl cbcu cblb cblc cbol ccaa ccab ccac ccba ccbc ccca cccb cccc cccl cccu ccla cclc ccob ccoc ccuc clab clau clob cloo clou club coal coba cobb cobo cobu coca coco cocu col- cola colb coll colo colu coob cool coua coub coul cuau cub- cuba cubb cuca cucc cula culb culc cull culo laaa laac laal laba labo labu laca lacc lacl laco lacu lala lall lalo lalu laou laub laul lbcc lcac lcbc lcca lccc llao llcc lllc llll lloa lloc lloo loac lob- loba lobb lobo loca locc loco locu lola loll lolo loob looc lool loul louu luau luba luca lula lull lulu luua oaau oall obal obba obbo obla oblu obol ocab ocac ocal ocbc occa occc oclc ocul olac olba olbo olca olcc olla ollo ooaa ooba oola oolo oooo ouac oucc oula oulu ouu- uabc uaca uaoc uaua ubac ubal ubba ubbo ubla ublo uboc ucal ucbc ucca ucla ucua ulaa ulbc ulcc ulco ulla ullo ulo- uloc ulua ulul uocc uolc uulu uuoc uuuu