a-ak aaaa aaac aaaf aaal aaas aaca aacc aacf aack aacl aacs aafa aafc aaff aafl aaka aala aalc aall aals aasa aasc aasf aass acaa acac acas acca accc accf accs acfc acfl acfs acks acla aclc acls acsa acsc acsl acss afaa afak afca afcc afcs affa affc affs afka afla aflc afsa afsc akaa akal akas akca akka aksa alaa alac alak alal alas alca alcc alcs alfa alfs alk- alka all- alla alll alls alsa alsc asaa asac asaf asak asal asas asc- asca ascc ascl asfa aska asks asla assa assc assk assl asss caaa caac caaf caal caas cac- caca cacc cack cafa cafc caff cafl cafs caka cala calc calf calk call cals casa casc cask casl cass ccaa ccac ccaf ccas ccca cccc cccf cccl cccs ccfa ccfc ccff ccfl ccla cclc ccls ccsa ccsf ccsl ccss cfaa cfac cfca cfcf cfcl cfcs cfls cfsa cfsl ckac ckck ckcl ckcs cklf cksa cksl claf clas clsa clsc csaa csac csak csas cscc cscf cscl cscs csfc cska csks csla cssa f--k faaa faac faas faca facc fack facs fafa fafc faff fala falc falk fall fals fasa fasc fass fcal fcas fcca fccf fcsc fcsl ffcc ffff ffsa ffss flac flak flcl fsas fscc fsck fssa fssc fssf kaaa kaaf kaak kaal kaas kacc kacl kacs kafa kafc kaff kafs kaka kakc kakk kaks kala kalc kalf kalk kall kals kas- kasa kasc kasf kask kasl kass kcaa kcac kcal kcas kcca kccc kcck kccl kcfa kcfc kcfl kckc kckf kckk kckl kcla kclc kclf kclk kcll kcls kcsa kcsc kcsf kcss kfac kfal kfcf kfcs kffa kfff kffk kfka kfla kflc kflf kfll kfls kfsa kfsk kkaa kkac kkal kkck kkcl kkcs kkfs kkkk kklc kklf kkll kkls kksa kksf kkss klaa klac klaf klak klal klas klca klcc klck klcl klcs klfa klfc klff klka klkc klkk klkl klks klla kllc kllk klls klsa klsc klsf ksac ksaf ksak ksal ksas ksca ksck kscl kscs ksfa ksfc kska kskf kskk ksks ksla kslc kslk ksll kssa kssl ksss laaa laac laak laal laas laca lacc lack lacl lacs lafc laff laka laks lala lall lasa lask lass lcac lcca lccc lccs lcfc lcls lcsc lfca lfcc lkal lkfs llcc llcs llks lllc llll lscs lsfc lsla lssa sa-c saac saaf saak saal saas saca sacc sack sacs safa safc saff saka sakk saks sala salc salf salk sall sals sasa sasc sasf sask sasl sass scaa scac scaf scak scal scas sccc sccl sccs scfa scfc sck- sckl scl- sclc sclk scls scsa scsc scsl sfas sfca sfcc sfcs sffc sfla sflc sfls sfss skac skaf skal skfc skss slaa slac slaf slak slas slcc slsa slsc ssaa ssac ssas ssca sscc sscs ssfc ssfl ssla sslc sssa sssc sssf ssss