aaaa aaab aaac aaaf aaar aaba aabb aabc aabt aaca aacb aacc aacf aacr aact aafa aafb aafc aaff aara aarc aart aata aatc aatf aatt abaa abab abac abaf abar abat abb- abba abbb abbr abbt abca abcb abcc abcf abcr abct abff abra abrc abta ac-t acaa acab acac acar acat acba acca accc accf acct acfc acft acr- acra acrc acrr acta actc actf actt afaa afar afat afca afcb afcc affa affc afft afr- afra afrc afta aftc arab arac araf arar arat arba arc- arca arct arfa arfb arfc arff arft arr- arra arrc arrr arrt arta artc artr at-t ataa atab atac atar atat atca atcc atcf atcr atfb atfc atra atrc atta attr baaa baaf baar baat baba babb babr bac- baca bacc bact bafc baff baft bar- bara barb barc barf barr bart bata batc batf batt bbbb bbfc bbrc bcaa bcar bcat bcbc bcca bccc bcfc bcra bctc bfca bfta bftt brab brac braf brat brca brcb brfc brrr brtc btaa btaf btcc btfc btrc btrt bttb caaa caab caac caaf caat caba cabf cac- caca cacc cacr cafa cafb cafc caff cara carb carc carf carr cart cat- cata catb catc catf catt cbac cbar cbat cbbc cbca cbcc cbcr cbct cbfb cbfc cbrt cbta cbtc cbtf ccaa ccab ccac ccaf ccar ccat ccba ccbc ccca cccb cccc cccf ccfa ccfc ccff ccra ccrc ccrf ccrt cctb cctc cctt cfaa cfab cfac cfar cfbc cfbr cfbt cfca cfcb cfcf cffb cffr cfra cfrb cfrt cfta cftc cftr crab crac craf crar crat crbc crca crcc crcr crfc crrt crtc crtf ctab ctba ctca ctcf ctfc ctrc ctta faaa faac faba faca facc fact fafa fafc faff fara farb farc farr fart fata fatc fatf fatt fbar fcab fcar fcat fcba fcca fccf fcra ffar ffcc ffff ffrr fftf frab frac frat frbc frcc frfc frta ft-c ftfc raab raaf raat raba rabb rac- raca racc ract rafa rafc raff raft rara rarb rarf rata ratf ratt rbaf rbbb rbbr rcac rcaf rcbc rccb rccc rcfc rctc rffc rftc rrat rrfc rrrr rtbf rtca rtcc rtfb rtfc taa- taaf taar taat taba tabb tabc taca tacc tact tafa tafc taff taft tara tarb tarc tarf tarr tart tata tatb tatr tatt tbaf tbar tbca tbcb tbcc tbrb tbta tcca tccc tcfc tctc tfca tftc traa trab trac traf trat trca trcc trfc trfr trra trtc trtr ttab ttbb ttfa ttfc ttff tttt