-al -ol a-a a-b a-c aaa aab aac aal aao aar aas ab- aba abb abc abl abo abr abs ac- aca acb acc acl aco acr acs al- ala alb alc all alo alr als aoa aob aoc aol aoo aor aos ar- ara arb arc arl aro arr ars as- asa asb asc asl aso asr ass baa bab bac bal bao bar bas bba bbb bbc bbl bbo bbr bbs bca bcb bcc bcl bco bcr bcs bla blb blc bll blo blr bls boa bob boc bol boo bor bos bra brb brl bro brr brs bsa bsb bsc bsl bso bsr bss c-- caa cab cac cal cao car cas cba cbb cbc cbl cbo cbr cbs cca ccb ccc ccl cco ccr ccs cl- cla clb clc cll clo clr cls co- coa cob coc col coo cor cos cra crb crc crl cro crr crs csa csb csc csl cso csr css la- laa lab lac lal lao lar las lba lbb lbc lbl lbo lbr lbs lca lcb lcc lcl lco lcr lcs lla llb llc lll llo llr lls loa lob loc lol loo lor los lra lrb lrc lro lrr lrs lsa lsb lsc lsl lso lsr lss oaa oab oac oal oao oar oas ob- oba obb obc obl obo obr obs oc- oca ocb occ ocl oco ocr ocs ola olb olc oll olo ols oo- ooa oob ooc ool ooo oor oos or- ora orb orc orl oro orr ors os- osa osb osc osl oso osr oss ra- raa rab rac ral rao rar ras rba rbb rbc rbl rbo rbr rbs rca rcb rcc rcl rco rcr rcs rla rlc rll rlo rlr rls roa rob roc rol roo ror ros rra rrb rrc rrl rrr rrs rsa rsb rsc rsl rso rsr rss saa sab sac sal sao sar sas sba sbb sbc sbl sbo sbr sbs sca scb scc scl sco scr scs sla slb slc sll slo slr sls soa sob soc sol soo sor sos sr- sra srb src srl sro srr srs ss- ssa ssb ssc ssl sso ssr sss

aaaa aaab aaac aaal aaar aaas aaba aabb aabc aabl aaca aacb aacc aacl aaco aacr aacs aala aalc aall aalo aals aaoo aara aarc aaro aars aasa aasc aass abaa abab abac abal abar abas abb- abba abbb abbo abbr abbs abca abcb abcc abcl abcr abcs abla ablo abls aboa abob abol aboo abor abos abra abrc abro abrs abs- absa absl abss acaa acab acac acar acas acba acbl acca accc acco accs acla aclc aclr acls acoa acol acor acos acr- acra acrc acro acrr acrs acsa acsc acsl acss alaa alac alal alao alar alas alb- alba albc albo albs alca alcc alco alcs all- alla alll allo allr alls aloa aloc alol aloo alor alos alro alsa alsc also aoba aoca aocs aola aora aorb aors aoss arab arac aral arar aras arba arbs arc- arca arco arcs arla arlo aroa arob aroo aror aros arr- arra arrc arro arrr arrs ars- arsa arsc arso asaa asab asac asal asao asar asas asba asbo asc- asca ascb ascc ascl asco ascr asla aslo aslr asob asoc asor asos asra asrc asro asrs assa assc assl asso assr asss baaa baal baar baas baba babb babo babr babs bac- baca bacc baco bacs bala balc ball balo bals baol baos bar- bara barb barc baro barr bars basa basc baso bass bbas bbbb bbbs bblb bbls bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccl bccs bcor bcos bcra bcrs bcsa bcsc bcsl bcss blaa blab blac blas blls blob bloc bloo blrc blss boab boac boal boar boas boba bobb bobo bobs boca boco bocs bola boll bolo bols boob booc bool boor boos bor- bora boro borr bors bosa bosc boso boss brab brac brao bras brca brcb brls broa brob broc brol broo bror bros brrr brrs brsb brsr bsaa bsac bsas bscs bslc bsos bsra bssc c-bo caaa caab caac caal caas caba cabo cabs cac- caca cacc caco cacr cala calc call calo cals caol caor caos cara carb carc carl caro carr cars casa casb casc casl caso casr cass cbac cbal cbar cbbc cbbs cbca cbcc cbcl cbcr cbcs cblb cblc cbol cbrl cbsa cbsc ccaa ccab ccac ccar ccas ccba ccbc ccca cccb cccc cccl cccs ccla cclc ccls ccob ccoc ccra ccrc ccrl ccrs ccsa ccsl ccss clab clar clas clob cloo clor clos clra clro clrs clsa clsc coal coas coba cobb cobo cobs coca coco col- cola colb coll colo cols coob cool coos cor- cora corb corc corl coro corr cors cosa cosc cosl coso coss crab crac crar cras crbc crca crcc crcr crls crob croc crol croo cror crsa crss csaa csab csac csao csar csas cscb cscc cscl csco cscr cscs csla cslr csob csor csos csra csrc csrs cssa cssr laaa laac laal laar laas laba labo labr labs laca lacc lacl laco lacs lala lall lalo laos lara larb larc larr lars lasa laso lass lbar lbcc lblr lbos lbrs lbsc lcac lcbc lcca lccc lccs lcls lcor lcra lcrl lcrs lcsc lcsr llao llbs llcc llcs lllc llll lloa lloc lloo loac loar loas lob- loba lobb lobo lobs loca locc loco locs lola loll lolo lols loob looc lool loor loos lora loro lors losa losc loso loss lrac lral lrba lrcs lroc lrrc lrrr ls-r lscb lsco lscs lsla lsrc lssa lsso lssr oall oara oars oasc oasl oass obal obas obba obbo obla obls obol obor obos obra obro obsr obss ocab ocac ocal ocas ocbc occa occc oclc ocos ocra ocrl ocro ocrr ocrs ocsa olac olar olas olba olbo olca olcc olla ollo olor olos ooaa ooba oocr oola oolo oooo ooos oora oosa orab orac oral orao orar oras orba orbb orbo orbs orca orco orcs orla orlo oro- oror oros