aaaa aaab aaac aaap aaar aaba aabb aabc aabp aaca aacb aacc aacp aacr aapa aapc aara aarc aarp abaa abab abac abap abar abb- abba abbb abbr abca abcb abcc abcp abcr abpa abpc abpp abpr abra abrc acaa acab acac acap acar acba acca accc accp acpa acpr acr- acra acrc acrr apac apap apar apba apbr apca apcb apcc apcr appa appc appr apra aprc arab arac arap arar arba arc- arca arpa arr- arra arrc arrr baaa baar baba babb babr bac- baca bacc bapa bapc bapp bar- bara barb barc barr bbbb bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcpp bcra bpcp bprc brab brac brca brcb brrr caaa caab caac caap caba cac- caca cacc cacr capa capb capc capp cara carb carc carp carr cbac cbar cbbc cbca cbcc cbcp cbcr cbpc cbpp ccaa ccab ccac ccap ccar ccba ccbc ccca cccb cccc cccp ccpa ccpp ccpr ccra ccrc ccrp cpaa cpac cpap cpbc cpca cppa crab crac crap crar crbc crca crcc crcr crpc paap paar paba paca papa papb papp papr par- para parc parp parr pbac pbar pbcc pbpa pcaa pcap pcba pcbc pcca pccc pcpb pcpp pcra pcrc ppac ppap ppar ppcc pppa pppp pprc prar prbc prca prcc prcp raab raba rabb rac- raca racc rapa rapc rapp rara rarb rbbb rbbr rcac rcbc rccb rccc rpca rrrr