aaaa aaab aaac aaar aaas aaba aabb aabc aabt aaca aacb aacc aaco aacr aacs aact aaoo aara aarc aaro aars aart aasa aasc aass aast aata aatc aatt abaa abab abac abar abas abat abb- abba abbb abbo abbr abbs abbt abca abcb abcc abcr abcs abct aboa abob aboo abor abos abot abra abrc abro abrs abs- absa abss abta abts ac-t acaa acab acac acar acas acat acba acca accc acco accs acct acoa acor acos acot acr- acra acrc acro acrr acrs acsa acsc acss acst acta actc acto acts actt aoba aoca aocs aora aorb aors aort aoss aotc arab arac arar aras arat arba arbs arc- arca arco arcs arct aroa arob aroo aror aros arr- arra arrc arro arrr arrs arrt ars- arsa arsc arso arst arta artc arto artr arts asaa asab asac asao asar asas asat asba asbo asc- asca ascb ascc asco ascr asct asob asoc asor asos asot asra asrc asro asrs assa assc asso assr asss asst asta astb astc asto astr asts at-t ataa atab atac atar atas atat atbs atca atcc atco atcr atcs atob atoc ator atos atot atra atrc atro atsb atsc atst atta atto attr atts baaa baar baas baat baba babb babo babr babs bac- baca bacc baco bacs bact baos bar- bara barb barc baro barr bars bart basa basc baso bass bast bata batc bato bats batt bbas bbbb bbbs bbrc bcaa bcar bcas bcat bcbc bcbs bcca bccc bccs bcor bcos bcra bcrs bcsa bcsc bcss bctc bcts boab boac boar boas boat boba bobb bobo bobs boca boco bocs boob booc boor boos boot bor- bora boro borr bors bort bosa bosc boso boss bost bota botb boto bots bott brab brac brao bras brat brca brcb broa brob broc broo bror bros brot brrr brrs brsb brsr brst brtc bsaa bsac bsas bsat bscs bsos bsra bssc bsts btaa btcc btcs btob btor btrc btrt btss bttb c-bo caaa caab caac caas caat caba cabo cabs cac- caca cacc caco cacr caor caos cara carb carc caro carr cars cart casa casb casc caso casr cass cast cat- cata catb catc cato cats catt cbac cbar cbat cbbc cbbs cbca cbcc cbcr cbcs cbct cbot cbrt cbsa cbsc cbta cbtc ccaa ccab ccac ccar ccas ccat ccba ccbc ccca cccb cccc cccs ccob ccoc ccra ccrc ccrs ccrt ccsa ccss ccst cctb cctc cctt coas coat coba cobb cobo cobs coca coco coct coob coos coot cor- cora corb corc coro corr cors cort cosa cosc coso coss cost cota cotb cotc coto cots cott crab crac crar cras crat crbc crca crcc crcr crob croc croo cror crot crrt crsa crss crst crtc crts csaa csab csac csao csar csas csat cscb cscc csco cscr cscs csob csor csos csot csra csrc csrs cssa cssr csta cstc csto cstr csts ctab ctba ctbs ctca ctor ctos ctot ctrc ctrs ctsa ctsc ctss ctta ctts oara oars oasc oass oast oats obas obba obbo obor obos obot obra obro obsr obss obst obts ocab ocac ocas ocat ocbc occa occc occt ocos ocra ocro ocrr ocrs ocsa oct- octa octo octs ooaa ooba oocr oooo ooos oora oort oosa oost ootb oots orab orac orao orar oras orat orba orbb orbo orbs orca orco orcs oro- oror oros orot orra orro orrs orsa orso orta ortc orto orts osar osas osat osba osca oscc osco osoo osor osos osro ossa ossb osso osta ostc ostr osts otac otar otas otbs oto- otoo otor otos otra otro otrs otsa otso otta otto otts raab raas raat raba rabb rabo rabs rac- raca racc raco racs ract raob raoc raos rara rarb raro rars rasa rasc raso rass rast rata rato rats ratt rbbb rbbr rbbs rbss rbst rcac rcas rcbc rcbo rccb rccc rccs rcos rcsa rcsc rcss rctc rcts roab roar roas roat rob- roba robb robo robs robt roca rocc roco rocs roob roor roos root rora rorc roro rort rosa rosc roso ross rost rota rotc roto rotr rots rott rras rrat rrrr rsaa rscc rscs rsos rssa rsts rtas rtca rtcc rtss rtts s-os sa-c saab saac saar saas saat saba sabb sabc sabo sabr sabs saca sacc saco sacr sacs sact saor saos sara sarc saro sarr sars sart sasa sasc saso sass sast sata satb satc sato satr sats satt sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbct sbor sbot sbsa sbst sbtc scaa scab scac scar scas scat scba sccc sccs scct scob scoo scor scot scr- scra scrc scrs scsa scsc scso scsr scst sctc scto sctr scts soar soas soat soba sobo sobr sobs sobt soca soco socr socs soor soos soot sora sorb soro sorr sors sort sosa soso soss sost sota sotc soto sots sras srbc srcc srct sros srta srtr ssaa ssab ssac ssao ssas ssat ssbr ssca sscc sscs ssoc ssot ssra ssrc ssrs sssa sssb sssc ssss ssta sstb sstc ssts stab stac star stas stat stbc stbs stca stcc stcs stoa stob stoo stor stos stot stra strc stro strs stss sttc sttr taa- taar taas taat taba tabb tabc tabo tabs taca tacc taco tacs tact taoa taor taos tara tarb tarc taro tarr tars tart tasa tasb tasc tasr tass tast tata tatb tato tatr tats tatt tbar tbas tbbs tbca tbcb tbcc tbrb tbst tbta tcbs tcca tccc tcos tctc tcts toab toas toat toba tobo tobs tobt toca toco tooa toor toos toot tora torc toro torr tors tort tosa tosb tosc toso toss tost tota totc toto totr tots tott traa trab trac trao tras trat trca trcc troa troc troo tros trot trra trst trtc trtr tsaa tsao tsar tsat tsbc tsca tscc tsob tsos tssa tssr tsst tstc tsts ttab ttbb ttss tttt