a-ak aaaa aaab aaar aaas aaav aaba aabb aaka aara aars aasa aass aava abaa abab abak abar abas abb- abba abbb abbr abbs abra abrs abs- absa abss abva akaa akar akas akka akr- akra aksa arab arak arar aras arba arbs arka arks arr- arra arrk arrr arrs ars- arsa arsk arva asaa asab asak asar asas asba aska askr asks asra asrs assa assk assr asss asva asvs avab avar avas avra avva baaa baak baar baas baba babb babr babs bak- baka bakr baks bar- bara barb bark barr bars basa bask bass bava bbas bbbb bbbs brab brak bras brav brka brkb brrr brrs brsb brsr bsaa bsas bsra kaaa kaab kaak kaar kaas kaba kabb kabr kaka kakk kaks kara karb kark karr kars karv kas- kasa kasb kask kasr kass kava kavb kavs kavv kbaa kbab kbak kbar kbas kbba kbbb kbbk kbbr kbbs kbkb kbkk kbkr kbkv kbra kbrb kbrk kbrv kbsa kbsb kbsk kbsr kbss kbsv kbva kbvb kbvr kkaa kkar kkba kkbb kkbr kkbs kkkk kkrb kkrk kkrr kkrs kkrv kksa kksr kkss kkvr kkvv krab krak krar kras krav krba krbb krbk krbr krka krkk krkr krks krkv krrb krrk krrr krrs krsa krsk krsr krss krsv krva krvb krvk krvr krvs krvv ksab ksak ksar ksas ksav ksba ksbr ksbs ksbv kska kskb kskk kskr ksks ksra ksrb ksrr ksrs ksrv kssa kssr ksss ksva ksvr kvab kvak kvar kvas kvbr kvra kvrr kvrv kvsa kvsr kvss kvsv kvvr kvvs kvvv raab raak raas raba rabb rabk rabs raka rakk rara rarb rark rars rasa rask rass rava rbbb rbbr rbbs rbss rkss rksv rras rrrr rsaa rssa saab saak saar saas saba sabb sabr sabs saka sakb sakk saks sara sark sarr sars sarv sasa sask sass sava savs sbaa sbar sbas sbbs sbrk sbsa skab skar skra skss sras ssaa ssab ssas ssbr ssra ssrs sssa sssb ssss svar vaar vaas vabs vaka vara vark varr vars vas- vasa vass vava vavs vrak vras vrav vrba vrsa vvsb vvvv