aaaa aaac aaaf aaal aaca aacc aacf aacl aaco aafa aafc aaff aafl aala aalc aall aalo aaoo acaa acac acca accc accf acco acfc acfl acla aclc acoa acol afaa afao afca afcc affa affc affo afla aflc afoa afol afoo alaa alac alal alao alca alcc alco alfa all- alla alll allo aloa aloc alof alol aloo aoca aola caaa caac caaf caal cac- caca cacc caco cafa cafc caff cafl cala calc calf call calo caol ccaa ccac ccaf ccca cccc cccf cccl ccfa ccfc ccff ccfl ccla cclc ccoc cfaa cfac cfao cfca cfcf cfcl cfco cfoa claf clof cloo coal coca coco cofc coff col- cola coll colo coof cool faaa faac faca facc fafa fafc faff fafo fala falc fall falo fcal fcca fccf ffcc ffff flac flao flcl floc floo foaf foal foca foco fofo fola folc foll folo foof fool laaa laac laal laca lacc lacl laco lafc laff lala lall lalo lcac lcca lccc lcfc lfca lfcc llao llcc lllc llll lloa lloc lloo loac loaf loca locc loco lofa loff lola loll lolo looc loof lool oafc oafo oall ocac ocal occa occc ocfa oclc ofcl off- offa offc offo ofla olac olaf olca olcc olfa olla ollo olof ooaa ooff oola oolo oooo