-al a-a a-b a-c a-t aaa aab aac aal aar aas aat ab- aba abb abc abl abr abs abt ac- aca acb acc acl acr acs act al- ala alb alc all alr als alt ar- ara arb arc arl arr ars art as- asa asb asc asl asr ass ast at- ata atb atc atl atr ats att baa bab bac bal bar bas bat bba bbb bbc bbl bbr bbs bbt bca bcb bcc bcl bcr bcs bct bla blb blc bll blr bls blt bra brb brl brr brs brt bsa bsb bsc bsl bsr bss bst bta btb btc btl btr bts btt c-- caa cab cac cal car cas cat cba cbb cbc cbl cbr cbs cbt cca ccb ccc ccl ccr ccs cct cl- cla clb clc cll clr cls clt cra crb crc crl crr crs crt csa csb csc csl csr css cst cta ctb ctc ctl ctr cts ctt la- laa lab lac lal lar las lat lba lbb lbc lbl lbr lbs lbt lca lcb lcc lcl lcr lcs lct lla llb llc lll llr lls llt lra lrb lrc lrr lrs lrt lsa lsb lsc lsl lsr lss lst lta ltb ltc ltl ltr lts ltt ra- raa rab rac ral rar ras rat rba rbb rbc rbl rbr rbs rbt rca rcb rcc rcl rcr rcs rct rla rlc rll rlr rls rlt rra rrb rrc rrl rrr rrs rrt rsa rsb rsc rsl rsr rss rst rta rtb rtc rtl rtr rts rtt saa sab sac sal sar sas sat sba sbb sbc sbl sbr sbs sbt sca scb scc scl scr scs sct sla slb slc sll slr sls slt sr- sra srb src srl srr srs srt ss- ssa ssb ssc ssl ssr sss sst sta stb stc stl str sts stt taa tab tac tal tar tas tat tba tbb tbc tbl tbr tbs tbt tca tcb tcc tcl tcr tcs tct tla tlc tll tlr tls tlt tra trb trc trl trr trs trt tsa tsb tsc tsl tsr tss tst tta ttb ttc ttl ttr tts ttt

aaaa aaab aaac aaal aaar aaas aaba aabb aabc aabl aabt aaca aacb aacc aacl aacr aacs aact aala aalc aall aals aara aarc aars aart aasa aasc aass aast aata aatc aatt abaa abab abac abal abar abas abat abb- abba abbb abbr abbs abbt abca abcb abcc abcl abcr abcs abct abla abls abra abrc abrs abs- absa absl abss abta abts ac-t acaa acab acac acar acas acat acba acbl acca accc accs acct acla aclc aclr acls acr- acra acrc acrr acrs acsa acsc acsl acss acst acta actc actl acts actt alaa alac alal alar alas alat alb- alba albc albs alca alcc alcs all- alla alll allr alls alsa alsc alst alta alts arab arac aral arar aras arat arba arbs arc- arca arcs arct arla arr- arra arrc arrr arrs arrt ars- arsa arsc arst arta artc artr arts asaa asab asac asal asar asas asat asba asc- asca ascb ascc ascl ascr asct asla aslr asra asrc asrs assa assc assl assr asss asst asta astb astc astl astr asts at-l at-t ataa atab atac atal atar atas atat atbs atca atcc atcl atcr atcs atla atls atra atrc atsb atsc atst atta attr atts baaa baal baar baas baat baba babb babr babs bac- baca bacc bacs bact bala balc ball bals balt bar- bara barb barc barr bars bart basa basc bass bast bata batc bats batt bbas bbbb bbbs bblb bbls bbrc bcaa bcar bcas bcat bcbc bcbs bcca bccc bccl bccs bcra bcrs bcsa bcsc bcsl bcss bctc bcts blaa blab blac blas blat blbt blls blrc blss blst blts brab brac bras brat brca brcb brls brrr brrs brsb brsr brst brtc bsaa bsac bsas bsat bscs bslc bsra bssc bsts btaa btcc btcl btcs btla btrc btrt btss bttb caaa caab caac caal caas caat caba cabs cac- caca cacc cacr cala calc call cals calt cara carb carc carl carr cars cart casa casb casc casl casr cass cast cat- cata catb catc cats catt cbac cbal cbar cbat cbbc cbbs cbca cbcc cbcl cbcr cbcs cbct cblb cblc cbrl cbrt cbsa cbsc cbta cbtc cbtl ccaa ccab ccac ccar ccas ccat ccba ccbc ccca cccb cccc cccl cccs ccla cclc ccls ccra ccrc ccrl ccrs ccrt ccsa ccsl ccss ccst cctb cctc cctl cctt clab clar clas clat clra clrs clsa clsc cltb cltc clts crab crac crar cras crat crbc crca crcc crcr crls crrt crsa crss crst crtc crtl crts csaa csab csac csar csas csat cscb cscc cscl cscr cscs csla cslr csra csrc csrs cssa cssr csta cstc cstr csts ctab ctal ctba ctbs ctca ctls ctrc ctrl ctrs ctsa ctsc ctss ctta ctts laaa laac laal laar laas laat laba labr labs laca lacc lacl lacs lact lala lall lara larb larc larr lars lart lasa lass last lata latc lats latt lbar lbcc lblr lbrs lbrt lbsc lcac lcat lcbc lcca lccc lccs lcls lcra lcrl lcrs lcsc lcsr lctl lcts llat llbs llcc llcs lllc llll lrac lral lrat lrba lrcs lrrc lrrr lrst lrta lrts ls-r lsat lscb lscs lsla lsrc lssa lssr lsts ltac ltbl ltcc ltcs ltra ltrs ltsa ltsr lttc lttr raab raas raat raba rabb rabl rabs rac- raca racc racs ract rala ralb rall ralt rara rarb rars rasa rasc rasl rass rast rata rats ratt rbbb rbbr rbbs rbcl rbsl rbss rbst rcac rcas rcbc rccb rccc rccs rcls rcsa rcsc rcsl rcss rctc rcts rlab rlcs rlls rras rrat rrrr rsaa rscc rscs rslc rssa rssl rsts rtas rtca rtcc rtls rtlt rtss rtts sa-c saab saac saal saar saas saat saba sabb sabc sabr sabs saca sacc sacr sacs sact sala salc sall sals salt sara sarc sarl sarr sars sart sasa sasc sasl sass sast sata satb satc satl satr sats