-ana aaaa aaab aaan aaar aaas aaba aabb aana aara aars aasa aass abaa abab aban abar abas abb- abba abbb abbr abbs abra abrs abs- absa abss ana- anaa anab anan anar anas anba anbb anna annb anns ansa arab aran arar aras arba arbs arna arns arr- arra arrr arrs ars- arsa asaa asab asan asar asas asba asra asrs assa assn assr asss baaa baan baar baas baba babb babr babs bana bann banr bans bar- bara barb barn barr bars basa bass bbas bbbb bbbs bnas bnrr bnss brab bran bras brna brns brrr brrs brsb brsr bsaa bsas bsns bsra naaa naab naan naar naas naba nabs nan- nana nanb nann nans nara narn narr nars nas- nasa nasb nasr nass nbaa nbar nbas nnnn nnsa nnss nrab nras nrna nrsa nsaa nsar nsna nsnr nsra nssa nssb nssr nsss raab raan raas raba rabb rabs rana rann rans rara rarb rars rasa rass rbbb rbbr rbbs rbss rnas rnbr rras rrna rrrr rsaa rsna rsnn rsnr rssa saab saan saar saas saba sabb sabr sabs sana sann sanr sans sara sarn sarr sars sasa sass sbaa sbar sbas sbbs sbsa snab snar snas snba snns snra snrs sras srna srnn ssaa ssab ssan ssas ssbn ssbr ssns ssra ssrs sssa sssb ssss