aaaa aaac aaae aaar aaca aacc aace aacr aaea aaec aara aarc aare acaa acac acae acar acca accc acce ace- acea acec acer acr- acra acrc acre acrr aeac aeer aer- aera aerc arac arae arar arc- arca arce area arec aree arr- arra arrc arre arrr caaa caac cac- caca cacc cace cacr caec caer cara carc care carr ccaa ccac ccar ccca cccc ccee ccra ccrc ccre ceac cear cec- ceca cece ceec cer- cera cerc cere crac crar crca crcc crce crcr cre- crea crec cree eaca eacc eaec eara eare ecaa ecac ecar ecca eccc ecce ecrc ecrr eeca eeea eeee eera eerc erca ercc erce erec erer erra errc erre rac- raca racc race raec raer rara rare rcac rccc rea- reac reae rear reca recc rece recr rera rere rrrr