a-ak aaaa aaac aaas aaca aacc aack aacs aaka aasa aasc aass acaa acac acas acca accc accs acks acsa acsc acss akaa akas akca akka aksa asaa asac asak asas asc- asca ascc aska asks assa assc assk asss caaa caac caas cac- caca cacc cack caka casa casc cask cass ccaa ccac ccas ccca cccc cccs ccsa ccss ckac ckck ckcs cksa csaa csac csak csas cscc cscs cska csks cssa kaaa kaak kaas kacc kacs kaka kakc kakk kaks kas- kasa kasc kask kass kcaa kcac kcas kcca kccc kcck kckc kckk kcsa kcsc kcss kkaa kkac kkck kkcs kkkk kksa kkss ksac ksak ksas ksca ksck kscs kska kskk ksks kssa ksss sa-c saac saak saas saca sacc sack sacs saka sakk saks sasa sasc sask sass scaa scac scak scas sccc sccs sck- scsa scsc skac skss ssaa ssac ssas ssca sscc sscs sssa sssc ssss