aaaa aaac aaar aaca aacc aacr aact aara aarc aart aata aatc aatt ac-t acaa acac acar acat acca accc acct acr- acra acrc acrr acta actc actt arac arar arat arc- arca arct arr- arra arrc arrr arrt arta artc artr at-t ataa atac atar atat atca atcc atcr atra atrc atta attr caaa caac caat cac- caca cacc cacr cara carc carr cart cat- cata catc catt ccaa ccac ccar ccat ccca cccc ccra ccrc ccrt cctc cctt crac crar crat crca crcc crcr crrt crtc ctca ctrc ctta raat rac- raca racc ract rara rata ratt rcac rccc rctc rrat rrrr rtca rtcc taa- taar taat taca tacc tact tara tarc tarr tart tata tatr tatt tcca tccc tctc traa trac trat trca trcc trra trtc trtr tttt