-al a-a a-b a-c aaa aab aac aad aal aar aas ab- aba abb abc abd abl abr abs ac- aca acb acc acd acl acr acs ad- ada adb adc add adl adr ads al- ala alb alc ald all alr als ar- ara arb arc ard arl arr ars as- asa asb asc asd asl asr ass baa bab bac bad bal bar bas bba bbb bbc bbd bbl bbr bbs bca bcb bcc bcd bcl bcr bcs bda bdb bdc bdd bdl bdr bds bla blb blc bld bll blr bls bra brb brd brl brr brs bsa bsb bsc bsd bsl bsr bss c-- caa cab cac cad cal car cas cba cbb cbc cbd cbl cbr cbs cca ccb ccc ccd ccl ccr ccs cda cdb cdc cdd cdl cdr cds cl- cla clb clc cld cll clr cls cra crb crc crd crl crr crs csa csb csc csd csl csr css daa dab dac dad dal dar das dba dbb dbc dbd dbl dbr dbs dca dcb dcc dcd dcl dcr dcs dda ddb ddc ddd ddl ddr dds dl- dla dlb dlc dld dll dlr dls dra drb drc drd drl drr drs dsa dsb dsc dsd dsl dsr dss la- laa lab lac lad lal lar las lba lbb lbc lbd lbl lbr lbs lca lcb lcc lcd lcl lcr lcs lda ldb ldc ldd ldl ldr lds lla llb llc lld lll llr lls lra lrb lrc lrd lrr lrs lsa lsb lsc lsd lsl lsr lss ra- raa rab rac rad ral rar ras rba rbb rbc rbd rbl rbr rbs rca rcb rcc rcd rcl rcr rcs rda rdb rdc rdd rdl rdr rds rla rlc rld rll rlr rls rra rrb rrc rrd rrl rrr rrs rsa rsb rsc rsd rsl rsr rss saa sab sac sad sal sar sas sba sbb sbc sbd sbl sbr sbs sca scb scc scd scl scr scs sda sdb sdc sdd sdl sdr sds sla slb slc sld sll slr sls sr- sra srb src srd srl srr srs ss- ssa ssb ssc ssd ssl ssr sss

aaaa aaab aaac aaad aaal aaar aaas aaba aabb aabc aabd aabl aaca aacb aacc aacd aacl aacr aacs aada aadc aads aala aalc aald aall aals aara aarc aard aars aasa aasc aasd aass abaa abab abac abad abal abar abas abb- abba abbb abbr abbs abca abcb abcc abcd abcl abcr abcs abda abla abls abra abrc abrs abs- absa absd absl abss acaa acab acac acad acar acas acba acbl acca accc accd accs acda acdb acdc acds acla aclc aclr acls acr- acra acrc acrr acrs acsa acsc acsd acsl acss adaa adab adac adad adal adar adas adba adbc adcc adcs adda addc addd addl addr adds adls adra adrs adsa adsl adsr adss alaa alac alad alal alar alas alb- alba albc albs alca alcc alcs ald- alda aldl alds all- alla alll allr alls alsa alsc arab arac arad aral arar aras arba arbs arc- arca arcs arda ardc ardl ards arla arr- arra arrc arrr arrs ars- arsa arsc arsd asaa asab asac asad asal asar asas asba asc- asca ascb ascc ascl ascr asda asdl asds asla aslr asra asrc asrs assa assc assd assl assr asss baaa baad baal baar baas baba babb babr babs bac- baca bacc bacs bada badb badd badr bads bala balc bald ball bals bar- bara barb barc bard barr bars basa basc bass bbad bbas bbbb bbbs bbdd bblb bbls bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccl bccs bcda bcds bcra bcrs bcsa bcsc bcsl bcss bd-r bdbc bddc bdls bdsd blaa blab blac blad blas bldc bldr blls blrc blss brab brac brad bras brca brcb brda brds brls brrr brrs brsb brsr bsaa bsac bsas bsbd bscs bsdl bslc bsra bsrd bssc bssd c-cd caaa caab caac caal caas caba cabs cac- caca cacc cacr cada cadc cadd cadr cads cala calc cald call cals cara carb carc card carl carr cars casa casb casc casd casl casr cass cbac cbal cbar cbbc cbbs cbca cbcc cbcl cbcr cbcs cbdb cbdc cbds cblb cblc cbrd cbrl cbsa cbsc ccaa ccab ccac ccad ccar ccas ccba ccbc ccca cccb cccc cccl cccs ccdc ccdr ccds ccla cclc ccls ccra ccrc ccrl ccrs ccsa ccsd ccsl ccss cd-r cdaa cdac cdad cdba cdcs cdda cddb cddl cddr cdls cdrs cdss clab clad clar clas clcd cldc cldr clra clrd clrs clsa clsc crab crac crar cras crbc crca crcc crcr crda crdc crls crsa crss csaa csab csac csar csas cscb cscc cscd cscl cscr cscs csda csdb csdr csla csld cslr csra csrc csrd csrs cssa cssd cssr daab daad daal daar daas daba dabb dabs daca dacs dada dads dala dall dals dara darb darc dard darl darr dars dasa dasb dasc dasd dasl dass dbar dbas dbcc dbcs dbls dbrs dbsa dbss dcas dcbc dcca dccb dccc dccl dccs dcdb dcds dcls dcra dcsc dcss dddd ddlc ddrc ddss dlab dlbd dlcs dlrs draa drab drac drad drar dras drba drbc drca drda drra drrs drsa dsac dsba dsbc dscc dscr dscs dsda dsdr dsls dsrc dsrr dssa dssc laaa laac laad laal laar laas laba labr labs laca lacc lacl lacs lada ladd lads lala lald lall lara larb larc lard larr lars lasa lasd lass lbar lbcc lbds lblr lbrs lbsc lcac lcad lcbc lcca lccc lccs lcdd lcdr lcds lcls lcra lcrd lcrl lcrs lcsc lcsd lcsr ldls ldrs llbs llcc llcs lldb lldc llds lllc llll lrac lral lrba lrcs lrdd lrds lrrc lrrr ls-r lscb lscs lsds lsla lsrc lssa lssr raab raad raas raba rabb rabl rabs rac- raca racc racs rada radc radd radl radr rads rala ralb rall rara rarb rars rasa rasc rasd rasl rass rbbb rbbr rbbs rbcl rbds rbsd rbsl rbss rcac rcas rcbc rccb rccc rccs rcdc rcds rcls rcrd