aaaa aaab aaac aaad aaap aaas aaba aabb aabc aabd aabp aaca aacb aacc aacd aacp aacs aada aadc aads aapa aapc aaps aasa aasc aasd aass abaa abab abac abad abap abas abb- abba abbb abbs abca abcb abcc abcd abcp abcs abda abpa abpc abpd abpp abps abs- absa absd absp abss acaa acab acac acad acap acas acba acca accc accd accp accs acda acdb acdc acdp acds acpa acpd acps acsa acsc acsd acss adaa adab adac adad adap adas adba adbc adcc adcs adda addc addd adds adp- adps adsa adss apac apap apas apba apbs apca apcb apcc apcd apcs apda apdd apds appa appc appd apps apsa apss asaa asab asac asad asap asas asba asc- asca ascb ascc ascp asda asds aspa aspc aspd asps assa assc assd assp asss baaa baad baas baba babb babs bac- baca bacc bacs bada badb badd bads bapa bapc bapp baps basa basc bass bbad bbas bbbb bbbs bbdd bcaa bcap bcas bcbc bcbp bcbs bcca bccc bccs bcda bcds bcpp bcps bcsa bcsc bcss bdbc bddc bdpc bdsd bpcp bpda bpsa bsaa bsac bsap bsas bsbd bscp bscs bspp bssc bssd c-cd caaa caab caac caap caas caba cabs cac- caca cacc cada cadc cadd cads capa capb capc capd capp caps casa casb casc casd casp cass cbac cbbc cbbs cbca cbcc cbcp cbcs cbdb cbdc cbds cbpc cbpp cbsa cbsc ccaa ccab ccac ccad ccap ccas ccba ccbc ccca cccb cccc cccp cccs ccdc ccdp ccds ccpa ccpp ccps ccsa ccsd ccsp ccss cdaa cdac cdad cdba cdcs cdda cddb cdps cdss cpaa cpac cpad cpap cpas cpbc cpca cpcs cppa cppd cpps cpsa cpsc csaa csab csac csas cscb cscc cscd cscs csda csdb csdp cspa cspb cspc cspd csps cssa cssd daab daad daap daas daba dabb dabp dabs daca dacs dada dads dapa dapp daps dasa dasb dasc dasd dass dbas dbcc dbcp dbcs dbpc dbpd dbsa dbss dcas dcbc dcca dccb dccc dccp dccs dcdb dcds dcps dcsc dcss dddd ddps ddss dpaa dpac dpbc dpcp dppa dppc dpsd dsac dsap dsba dsbc dscc dscp dscs dsda dsdp dsps dssa dssc dssp paap paas paba paca pacd pacs pada padd pads papa papb papp paps pasa pasc pasd pasp pass pbac pbcc pbpa pbsa pbsp pcaa pcad pcap pcas pcba pcbc pcbs pcca pccc pccs pcpb pcpp pcps pcsa pdac pdas pdbs pdca pdcp pdpa pdsa pdsd pdss ppac ppad ppap ppcc ppcd ppcs ppds pppa pppd pppp ppps ppss psac psap psas psbd psca psdc psdp psds pspp psps pssa pssc sa-c saab saac saad saap saas saba sabb sabc sabs saca sacc sacd sacs sada sadb sadc sadd sads sapa sapp saps sasa sasc sasd sass sbaa sbac sbas sbbs sbca sbcc sbcs sbds sbsa sbsd sbsp scaa scab scac scad scap scas scba sccc sccp sccs scda scdc scdp scds scpa scpb scps scsa scsc scsd sdap sdba sdcc sddc sdds sdps sdsc sdss sp-a spac spad spap spas spca spcc spcs spdc spdp sppd spps spsa spsd spsp spss ssaa ssab ssac ssap ssas ssca sscc sscp sscs ssdc ssdd ssdp sspa sspc ssps sssa sssb sssc ssss