aaaa aaab aaac aaad aaar aaas aaba aabb aabc aabd aabt aaca aacb aacc aacd aacr aacs aact aada aadc aads aadt aara aarc aard aars aart aasa aasc aasd aass aast aata aatc aatt abaa abab abac abad abar abas abat abb- abba abbb abbr abbs abbt abca abcb abcc abcd abcr abcs abct abda abra abrc abrs abs- absa absd abss abta abts ac-t acaa acab acac acad acar acas acat acba acca accc accd accs acct acda acdb acdc acds acdt acr- acra acrc acrr acrs acsa acsc acsd acss acst acta actc acts actt adaa adab adac adad adar adas adat adba adbc adcc adcs adda addc addd addr adds adra adrs adsa adsr adss adst adta adts arab arac arad arar aras arat arba arbs arc- arca arcs arct arda ardc ards arr- arra arrc arrr arrs arrt ars- arsa arsc arsd arst arta artc artr arts asaa asab asac asad asar asas asat asba asc- asca ascb ascc ascr asct asda asds asra asrc asrs assa assc assd assr asss asst asta astb astc astr asts at-t ataa atab atac atad atar atas atat atbs atca atcc atcr atcs atdt atra atrc atsb atsc atst atta attr atts baaa baad baar baas baat baba babb babr babs bac- baca bacc bacs bact bada badb badd badr bads bar- bara barb barc bard barr bars bart basa basc bass bast bata batc bats batt bbad bbas bbbb bbbs bbdd bbrc bcaa bcar bcas bcat bcbc bcbs bcca bccc bccs bcda bcds bcra bcrs bcsa bcsc bcss bctc bcts bd-r bdbc bddc bdsd brab brac brad bras brat brca brcb brda brds brdt brrr brrs brsb brsr brst brtc bsaa bsac bsas bsat bsbd bscs bsra bsrd bssc bssd bsts btaa btcc btcs btdt btrc btrt btss bttb c-cd caaa caab caac caas caat caba cabs cac- caca cacc cacr cada cadc cadd cadr cads cara carb carc card carr cars cart casa casb casc casd casr cass cast cat- cata catb catc catd cats catt cbac cbar cbat cbbc cbbs cbca cbcc cbcr cbcs cbct cbdb cbdc cbds cbrd cbrt cbsa cbsc cbta cbtc ccaa ccab ccac ccad ccar ccas ccat ccba ccbc ccca cccb cccc cccs ccdc ccdr ccds ccra ccrc ccrs ccrt ccsa ccsd ccss ccst cctb cctc cctt cd-r cdaa cdac cdad cdba cdcs cdda cddb cddr cdrs cdss crab crac crar cras crat crbc crca crcc crcr crda crdc crrt crsa crss crst crtc crts csaa csab csac csar csas csat cscb cscc cscd cscr cscs csda csdb csdr csra csrc csrd csrs cssa cssd cssr csta cstc cstd cstr csts ctab ctba ctbs ctca ctrc ctrs ctsa ctsc ctss ctta ctts daab daad daar daas daba dabb dabs dabt daca dacs dact dada dads dara darb darc dard darr dars dart dasa dasb dasc dasd dass dast data datr dats datt dbar dbas dbcc dbcs dbrs dbsa dbss dbtt dcas dcbc dcca dccb dccc dccs dcct dcdb dcds dcra dcsc dcss dctc dcts dddd ddrc ddss ddts draa drab drac drad drar dras drat drba drbc drca drda drra drrs drsa dsac dsba dsbc dscc dscr dscs dsda dsdr dsrc dsrr dssa dssc dsst dstc dsts dtaa dtac dtcc dtss raab raad raas raat raba rabb rabs rac- raca racc racs ract rada radc radd radr rads radt rara rarb rars rasa rasc rasd rass rast rata rats ratt rbbb rbbr rbbs rbds rbsd rbss rbst rcac rcas rcbc rccb rccc rccs rcdc rcds rcrd rcsa rcsc rcsd rcss rctc rcts rdac rdas rrad rras rrat rrrr rsaa rscc rscs rsdd rsds rssa rsts rtas rtca rtcc rtdt rtss rtts sa-c saab saac saad saar saas saat saba sabb sabc sabr sabs saca sacc sacd sacr sacs sact sada sadb sadc sadd sadr sads sadt sara sarc sard sarr sars sart sasa sasc sasd sass sast sata satb satc satd satr sats satt sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbct sbds sbsa sbsd sbst sbtc scaa scab scac scad scar scas scat scba sccc sccs scct scda scdc scds scr- scra scrc scrs scsa scsc scsd scsr scst sctc sctd sctr scts sdba sdcc sddc sdds sdrc sdrs sdsc sdss sras srbc srcc srct srsd srta srtr ssaa ssab ssac ssas ssat ssbr ssca sscc sscs ssdc ssdd ssra ssrc ssrs sssa sssb sssc ssss ssta sstb sstc sstd ssts stab stac stad star stas stat stbc stbd stbs stca stcc stcs stds stra strc strd strs stss sttc sttd sttr taa- taar taas taat taba tabb tabc tabs taca tacc tacs tact tada tads tara tarb tarc tard tarr tars tart tasa tasb tasc tasr tass tast tata tatb tatr tats tatt tbar tbas tbbs tbca tbcb tbcc tbcd tbrb tbst tbta tcad tcbs tcca tccc tcdd tctc tcts tdac tddb tdra tdss traa trab trac trad tras trat trca trcc trra trsd trst trtc trtr tsaa tsar tsat tsbc tsbd tsca tscc tsdb tssa tssr tsst tstc tsts ttab ttbb ttss tttt