a-ak aaaa aaac aaar aaas aaca aacc aack aacr aacs aaka aara aarc aars aasa aasc aass acaa acac acar acas acca accc accs acks acr- acra acrc acrr acrs acsa acsc acss akaa akar akas akca akka akr- akra aksa arac arak arar aras arc- arca arcs arka arks arr- arra arrc arrk arrr arrs ars- arsa arsc arsk asaa asac asak asar asas asc- asca ascc ascr aska askr asks asra asrc asrs assa assc assk assr asss caaa caac caas cac- caca cacc cack cacr caka cara carc cark carr cars casa casc cask casr cass ccaa ccac ccar ccas ccca cccc cccs ccra ccrc ccrs ccsa ccss ckac ckck ckcs ckrc cksa crac crar cras crca crcc crcr crkc crsa crss csaa csac csak csar csas cscc cscr cscs cska csks csra csrc csrs cssa cssr kaaa kaak kaar kaas kacc kacs kaka kakc kakk kaks kara kark karr kars kas- kasa kasc kask kasr kass kcaa kcac kcar kcas kcca kccc kcck kccr kckc kckk kckr kcrc kcrr kcrs kcsa kcsc kcsr kcss kkaa kkac kkar kkck kkcr kkcs kkkk kkrc kkrk kkrr kkrs kksa kksr kkss krac krak krar kras krca krcc krcs krka krkc krkk krkr krks krrc krrk krrr krrs krsa krsc krsk krsr krss ksac ksak ksar ksas ksca ksck kscr kscs kska kskk kskr ksks ksra ksrr ksrs kssa kssr ksss raak raas rac- raca racc rack racs raka rakk rara rark rars rasa rasc rask rass rcac rcas rccc rccs rcsa rcsc rcss rkss rras rrrr rsaa rscc rscs rssa sa-c saac saak saar saas saca sacc sack sacr sacs saka sakk saks sara sarc sark sarr sars sasa sasc sask sass scaa scac scak scar scas sccc sccs sck- scr- scra scrc scrs scsa scsc scsr skac skar skra skss sras srcc ssaa ssac ssas ssca sscc sscs ssra ssrc ssrs sssa sssc ssss