a-ak aaaa aaac aaaf aaas aaca aacc aacf aack aacs aafa aafc aaff aaka aasa aasc aasf aass acaa acac acas acca accc accf accs acfc acfs acks acsa acsc acss afaa afak afca afcc afcs affa affc affs afka afsa afsc akaa akas akca akka aksa asaa asac asaf asak asas asc- asca ascc asfa aska asks assa assc assk asss aza- azas azaz azca azza caaa caac caaf caas cac- caca cacc cack cafa cafc caff cafs caka casa casc cask cass caza ccaa ccac ccaf ccas ccca cccc cccf cccs ccfa ccfc ccff ccsa ccsf ccss cfaa cfac cfca cfcf cfcs cfsa ckac ckck ckcs cksa csaa csac csak csas cscc cscf cscs csfc cska csks cssa f--k faaa faac faas faca facc fack facs fafa fafc faff fasa fasc fass faza fcas fcca fccf fcsc ffcc ffff ffsa ffss fsas fscc fsck fssa fssc fssf fszk kaaa kaaf kaak kaas kacc kacs kacz kafa kafc kaff kafs kaka kakc kakk kaks kas- kasa kasc kasf kask kass kaza kazc kazf kazz kcaa kcac kcas kcca kccc kcck kcfa kcfc kckc kckf kckk kckz kcsa kcsc kcsf kcss kczz kfac kfaz kfcf kfcs kffa kfff kffk kfka kfsa kfsk kfsz kkaa kkac kkck kkcs kkfs kkkk kksa kksf kkss kkzz ksac ksaf ksak ksas ksaz ksca ksck kscs ksfa ksfc kska kskf kskk ksks kskz kssa ksss kssz kzaz kzfs kzks kzkz kzsc kzsf kzza kzzk kzzs kzzz sa-c saac saaf saak saas saaz saca sacc sack sacs safa safc saff saka sakk saks sasa sasc sasf sask sass saza scaa scac scaf scak scas sccc sccs scfa scfc sck- scsa scsc sfas sfca sfcc sfcs sffc sfss skac skaf skaz skfc skss ssaa ssac ssas ssca sscc sscs ssfc sssa sssc sssf ssss szss zaca zack zacs zaka zakk zaks zask zaza zsss zzzs zzzz