aaaa aaab aaac aaad aaal aaas aaba aabb aabc aabd aabl aaca aacb aacc aacd aacl aacs aada aadc aads aala aalc aald aall aals aasa aasc aasd aass abaa abab abac abad abal abas abb- abba abbb abbs abca abcb abcc abcd abcl abcs abda abla abls abs- absa absd absl abss acaa acab acac acad acas acba acbl acca accc accd accs acda acdb acdc acds acla aclc acls acsa acsc acsd acsl acss adaa adab adac adad adal adas adba adbc adcc adcs adda addc addd addl adds adls adsa adsl adss alaa alac alad alal alas alb- alba albc albs alca alcc alcs ald- alda aldl alds all- alla alll alls alsa alsc asaa asab asac asad asal asas asba asc- asca ascb ascc ascl asda asdl asds asla assa assc assd assl asss baaa baad baal baas baba babb babs bac- baca bacc bacs bada badb badd bads bala balc bald ball bals basa basc bass bbad bbas bbbb bbbs bbdd bblb bbls bcaa bcas bcbc bcbs bcca bccc bccl bccs bcda bcds bcsa bcsc bcsl bcss bdbc bddc bdls bdsd blaa blab blac blad blas bldc blls blss bsaa bsac bsas bsbd bscs bsdl bslc bssc bssd c-cd caaa caab caac caal caas caba cabs cac- caca cacc cada cadc cadd cads cala calc cald call cals casa casb casc casd casl cass cbac cbal cbbc cbbs cbca cbcc cbcl cbcs cbdb cbdc cbds cblb cblc cbsa cbsc ccaa ccab ccac ccad ccas ccba ccbc ccca cccb cccc cccl cccs ccdc ccds ccla cclc ccls ccsa ccsd ccsl ccss cdaa cdac cdad cdba cdcs cdda cddb cddl cdls cdss clab clad clas clcd cldc clsa clsc csaa csab csac csas cscb cscc cscd cscl cscs csda csdb csla csld cssa cssd daab daad daal daas daba dabb dabs daca dacs dada dads dala dall dals dasa dasb dasc dasd dasl dass dbas dbcc dbcs dbls dbsa dbss dcas dcbc dcca dccb dccc dccl dccs dcdb dcds dcls dcsc dcss dddd ddlc ddss dlab dlbd dlcs dsac dsba dsbc dscc dscs dsda dsls dssa dssc laaa laac laad laal laas laba labs laca lacc lacl lacs lada ladd lads lala lald lall lasa lasd lass lbcc lbds lbsc lcac lcad lcbc lcca lccc lccs lcdd lcds lcls lcsc lcsd ldls llbs llcc llcs lldb lldc llds lllc llll lscb lscs lsds lsla lssa sa-c saab saac saad saal saas saba sabb sabc sabs saca sacc sacd sacs sada sadb sadc sadd sadl sads sala salc sald sall sals sasa sasc sasd sasl sass sbaa sbac sbas sbbs sbca sbcc sbcs sbds sbsa sbsd scaa scab scac scad scal scas scba sccc sccl sccs scda scdc scds scl- sclc scls scsa scsc scsd scsl sdba sdcc sddc sdds sdla sdlc sdls sdsc sdsl sdss slaa slab slac slad slas slcc slcd slds slsa slsc ssaa ssab ssac ssas ssca sscc sscs ssdc ssdd ssla sslc sssa sssb sssc ssss