a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aacr aaea aaec aara aarc aare abaa abab abac abae abar abb- abba abbb abbe abbr abca abcb abcc abcr abec abee aber abra abrc acaa acab acac acae acar acba acca accc acce ace- acea acec acer acr- acra acrc acre acrr aeac aecb aeer aer- aera aerc arab arac arae arar arba arbe arc- arca arce area arec aree arr- arra arrc arre arrr baaa baar baba babb babe babr bac- baca bacc bace baer bar- bara barb barc bare barr bbbb bbeb bbrc bcaa bcar bcbc bcca bccc bcec bcer bcra bear beba bebb bebe beca beeb beer bera berc bere berr brab brac brae brca brcb brce brea breb brec bree brer brrr caaa caab caac caba cabe cac- caca cacc cace cacr caec caer cara carb carc care carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cber cbre ccaa ccab ccac ccar ccba ccbc ccca cccb cccc ccee ccra ccrc ccre ceac cear ceba cec- ceca cece ceeb ceec cer- cera cerc cere crab crac crar crbc crca crcc crce crcr cre- crea creb crec cree eaba eaca eacc eaec eara earb eare ebac ebba ebbc ebbr ebcc eber ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce ecra ecrc ecrr eeca eeea eeee eera eerc erba erbb erbe erca ercc erce ereb erec erer erra errc erre raab raba rabb rabe rac- raca racc race raec raer rara rarb rare rbbb rbbr rcac rcbc rccb rccc rea- reac reae rear reba rebb rebe reca recc rece recr reeb rera rere rrrr