a-fu aaaa aaab aaac aaad aaaf aaap aaba aabb aabc aabd aabp aaca aacb aacc aacd aacf aacp aacu aada aadc aadu aafa aafb aafc aafd aaff aapa aapc aaup abaa abab abac abad abaf abap abau abb- abba abbb abca abcb abcc abcd abcf abcp abda abdu abff abpa abpc abpd abpp abua abud abuf acaa acab acac acad acap acba acca accc accd accf accp accu acda acdb acdc acdf acdp acfc acfd acpa acpd acpu acu- acuf acup adaa adab adac adad adap adba adbc adcc adda addc addd addu adfa adfc adp- adua adub afaa afad afap afca afcb afcc afcu afdb afdc affa affc afpa afpc afua afud apac apap apba apca apcb apcc apcd apda apdd apdu apfa apfc appa appc appd appu apua apuc apud apup auaa auca aucp audc aufc aupc baaa baad baaf baba babb babu bac- baca bacc bada badb badd badu bafc baff bapa bapc bapp bapu bau- baud bauf bbad bbau bbbb bbdd bbfc bcaa bcap bcbc bcbp bcca bccc bcda bcfc bcpp bcuc bcup bdbc bddc bdpc bduf bfca bfpp bpcp bpda bpfc buad buba bubb bubu buca bucc bucu buda budb budd budu bufc buff bupa bupc c-cd caaa caab caac caaf caap caba cabf cabu cac- caca cacc cada cadc cadd cadu cafa cafb cafc caff cafu capa capb capc capd capp capu cauc cauf caup cbac cbbc cbca cbcc cbcp cbcu cbdb cbdc cbfb cbfc cbpc cbpp ccaa ccab ccac ccad ccaf ccap ccba ccbc ccca cccb cccc cccf cccp cccu ccdc ccdf ccdp ccfa ccfc ccfd ccff ccpa ccpp ccuc ccup cdaa cdac cdad cdba cdbf cdda cddb cdfa cfaa cfab cfac cfbc cfca cfcb cfcf cfda cfdp cffb cfpa cpaa cpac cpad cpaf cpap cpbc cpca cpcu cpff cppa cppd cuau cub- cuba cubb cuca cucc cuda cufa cufc cuff cupp daab daad daap daau daba dabb dabp dabu daca dada dadu dafa dafc daff dapa dapp dapu daub daud dbcc dbcp dbfc dbpc dbpd dbpf dcbc dcca dccb dccc dccp dccu dcdb dcfc dcup dddd ddub dfaf dfcc dfcu dffa dpaa dpac dpbc dpcp dppa dppc duaa duab duad dub- duba dubb dubc dubu duca duda dudd dudu dufc duff dufu dupa faaa faac faad faap faba fabd fabu faca facc facp fada fadd fafa fafc faff fapa fapp faud fcab fcap fcba fcca fccf fccp fcda fcpa fcup fdca ffcc ffff fp-c fpaa fpcc fpda fuad fubb fubu fuc- fuca fuda fudd fufc fuff fufu paap paba pabu paca pacd pacu pada padd padu pafa pafc paff papa papb papp paua paud paup pbac pbcc pbpa pcaa pcad pcaf pcap pcba pcbc pcca pccc pcfc pcpb pcpp pdac pdaf pdca pdcp pdfa pdpa pfaa pfcb pfff ppac ppad ppap ppcc ppcd ppfa pppa pppd pppp pubu puca pudu puff pupa pupu puuc uabc uaca uafa uaua ubac ubba ubpc ubud ucad ucbc ucca uccp ucdc ucdd ucfa ucfb ucpa ucpb ucua udaa udad udau udbc udca udpd ufcu uffa ufpb upac upca upda updf uppa uppc uppp uppu upup uucp uuuu