a-ak aaaa aaab aaac aaad aaaf aaal aaas aaba aabb aabc aabd aabl aaca aacb aacc aacd aacf aack aacl aacs aada aadc aads aafa aafb aafc aafd aaff aafl aaka aala aalc aald aall aals aasa aasc aasd aasf aass abaa abab abac abad abaf abak abal abas abb- abba abbb abbs abca abcb abcc abcd abcf abcl abcs abda abff abla abls abs- absa absd absf absl abss acaa acab acac acad acas acba acbl acca accc accd accf accs acda acdb acdc acdf acds acfc acfd acfl acfs ackd acks acla aclc acls acsa acsc acsd acsl acss adaa adab adac adad adak adal adas adba adbc adcc adcs adda addc addd addl adds adfa adfc adfl adfs adls adsa adsl adss afaa afad afak afbs afca afcb afcc afcs afdb afdc afdl affa affc affs afka afla aflc afsa afsb afsc akaa akal akas akca akka aksa alaa alac alad alak alal alas alb- alba albc albs alca alcc alcs ald- alda aldl alds alfa alfs alk- alka alkb alkd all- alla alll alls alsa alsc asaa asab asac asad asaf asak asal asas asba asc- asca ascb ascc ascl asda asdf asdl asds asfa aska asks asla assa assc assd assk assl asss baaa baad baaf baak baal baas baba babb babs bac- baca bacc back bacs bada badb badd bads bafc baff bak- baka bakl baks bala balc bald balf balk ball bals basa basc basf bask bass bbad bbas bbbb bbbs bbdd bbfc bblb bbls bcaa bcas bcbc bcbs bcca bccc bccl bccs bcda bcds bcfc bcsa bcsc bcsl bcss bdbc bddc bdls bdsd bfas bfca bfcs bffl bffs blaa blab blac blad blak blas bldc blfc blkb blkd blls blss bsaa bsac bsas bsbd bscs bsdl bsfa bsfc bsff bsfs bslc bssc bssd c-cd caaa caab caac caaf caal caas caba cabf cabs cac- caca cacc cack cada cadc cadd cads cafa cafb cafc caff cafl cafs caka cala calc cald calf calk call cals casa casb casc casd cask casl cass cbac cbal cbbc cbbs cbca cbcc cbcl cbcs cbdb cbdc cbds cbfb cbfc cbka cbkl cblb cblc cbsa cbsc ccaa ccab ccac ccad ccaf ccas ccba ccbc ccca cccb cccc cccf cccl cccs ccdc ccdf ccds ccfa ccfc ccfd ccff ccfl ccla cclc ccls ccsa ccsd ccsf ccsl ccss cdaa cdac cdad cdba cdbf cdcs cdda cddb cddl cdfa cdfs cdls cdss cfaa cfab cfac cfbc cfbs cfca cfcb cfcf cfcl cfcs cfda cfds cffb cfls cfsa cfsl ckac ckbc ckck ckcl ckcs cklf cksa cksb cksl clab clad claf clas clcd cldc clsa clsc csaa csab csac csak csas csbf cscb cscc cscd cscf cscl cscs csda csdb csfc cska csks csla csld cssa cssd daab daad daal daas daba dabb dabs daca dacs dada dads dafa dafc daff dafs daka daks dala dalf dalk dall dals dasa dasb dasc dasd dask dasl dass dbas dbcc dbcs dbfc dbfs dbls dbsa dbss dcas dcbc dcca dccb dccc dccl dccs dcdb dcds dcfc dcfs dcls dcsc dcss dddd ddlc ddss dfaf dfas dfcc dfcs dfds dffa dkba dkdc dlab dlbd dlcs dsac dsba dsbc dscc dscs dsda dsfa dsfc dsls dssa dssc f--k faaa faac faad faas faba fabd fabs faca facc fack facs fada fadd fads fafa fafc faff fala falc fald falk fall fals fasa fasc fasd fass fbla fbsd fcab fcal fcas fcba fcbs fcca fccf fcda fcds fcsc fcsl fdca ffcc ffff ffsa ffss fkab flab flac flad flak flcl fsas fscb fscc fsck fssa fssc fssf kaaa kaab kaaf kaak kaal kaas kaba kabb kabc kabd kabf kacb kacc kacd kacl kacs kad- kada kadd kadf kadl kads kafa kafc kaff kafs kaka kakc kakk kaks kala kalb kalc kald kalf kalk kall kals kas- kasa kasb kasc kasf kask kasl kass kbaa kbab kbac kbad kbak kbal kbas kbba kbbb kbbc kbbd kbbf kbbk kbbl kbbs kbca kbcb kbck kbcl kbcs kbdb kbdf kbdl kbds kbfb kbfc kbff kbfk kbfl kbfs kbkb kbkf kbkk kbkl kbla kblb kbld kblf kbll kbls kbsa kbsb kbsk kbss kcaa kcab kcac kcad kcal kcas kcba kcbc kcbd kcbf kcbk kcbl kcbs kcca kccb kccc kccd kcck kccl kcda kcdc kcdd kcds kcfa kcfb kcfc kcfd kcfl kckc kckf kckk kckl kcla kclc kclf kclk kcll kcls kcsa kcsb kcsc kcsd kcsf kcss kdaa kdab kdac kdad kdaf kdak kdal kdbb kdbl kdbs kdca kdcc kdcd kddb kddc kddd kddf kddk kddl kdfc kdka kdkb kdkd kdkk kdla kdlb kdlc kdld kdlf kdll kdls kdsc kdsd kdsk kdsl kdss kfab kfac kfal kfbc kfbk kfcd kfcf kfcs kfda kffa kffb kfff kffk kfka kfkb kfla kflb kflc kfld kflf kfll kfls kfsa kfsd kfsk kkaa kkac kkal kkba kkbb kkbd kkbl kkbs kkcb kkcd kkck kkcl kkcs kkda kkdc kkdd kkdl kkfs kkkk kklb kklc kkld kklf kkll kkls kksa kksd kksf kkss klaa klab klac klad klaf klak klal klas klbb klbc klbd klbf klbl klbs klca klcb klcc klcd klck klcl klcs kldc kldd klds klfa klfc klfd klff klka klkc klkk klkl klks klla kllb kllc kllk klls klsa klsc klsd klsf ksab ksac ksaf ksak ksal ksas ksba ksbc ksbl ksbs ksca kscb ksck kscl kscs ksdc ksdk ksdl ksds ksfa ksfb ksfc kska kskb kskd kskf kskk ksks ksla kslb kslc ksld kslk ksll kssa kssl ksss laaa laac laad laak laal laas laba labs laca lacc lack lacl lacs lada ladd lads lafb lafc laff laka laks lala lald lall lasa lasd lask lass lbcc lbds lbsc lcac lcad lcbc lcca lccc lccs lcdd lcds lcfc lcls lcsc lcsd ldcf ldls lfca lfcc lkab lkal lkfs llbs llcc llcs lldb lldc llds llks lllc llll lscb lscs lsds lsfc lsla lssa sa-c saab saac saad saaf saak saal saas saba sabb sabc sabs saca sacc sacd sack sacs sada sadb sadc sadd sadl sads safa safb safc saff saka sakb sakk saks sala salc sald salf salk sall sals sasa sasc sasd