a-a a-b a-c a-t aaa aab aac aao aar aas aat ab- aba abb abc abo abr abs abt ac- aca acb acc aco acr acs act aoa aob aoc aoo aor aos aot ar- ara arb arc aro arr ars art as- asa asb asc aso asr ass ast at- ata atb atc ato atr ats att baa bab bac bao bar bas bat bba bbb bbc bbo bbr bbs bbt bca bcb bcc bco bcr bcs bct boa bob boc boo bor bos bot bra brb bro brr brs brt bsa bsb bsc bso bsr bss bst bta btb btc bto btr bts btt c-- caa cab cac cao car cas cat cba cbb cbc cbo cbr cbs cbt cca ccb ccc cco ccr ccs cct co- coa cob coc coo cor cos cot cra crb crc cro crr crs crt csa csb csc cso csr css cst cta ctb ctc cto ctr cts ctt oaa oab oac oao oar oas oat ob- oba obb obc obo obr obs obt oc- oca ocb occ oco ocr ocs oct oo- ooa oob ooc ooo oor oos oot or- ora orb orc oro orr ors ort os- osa osb osc oso osr oss ost ot- ota otb otc oto otr ots ott ra- raa rab rac rao rar ras rat rba rbb rbc rbo rbr rbs rbt rca rcb rcc rco rcr rcs rct roa rob roc roo ror ros rot rra rrb rrc rrr rrs rrt rsa rsb rsc rso rsr rss rst rta rtb rtc rto rtr rts rtt saa sab sac sao sar sas sat sba sbb sbc sbo sbr sbs sbt sca scb scc sco scr scs sct soa sob soc soo sor sos sot sr- sra srb src sro srr srs srt ss- ssa ssb ssc sso ssr sss sst sta stb stc sto str sts stt taa tab tac tao tar tas tat tba tbb tbc tbo tbr tbs tbt tca tcb tcc tco tcr tcs tct to- toa tob toc too tor tos tot tra trb trc tro trr trs trt tsa tsb tsc tso tsr tss tst tta ttb ttc tto ttr tts ttt

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