a-a a-b a-c aaa aab aac aad aao aar aas ab- aba abb abc abd abo abr abs ac- aca acb acc acd aco acr acs ad- ada adb adc add ado adr ads aoa aob aoc aod aoo aor aos ar- ara arb arc ard aro arr ars as- asa asb asc asd aso asr ass baa bab bac bad bao bar bas bba bbb bbc bbd bbo bbr bbs bca bcb bcc bcd bco bcr bcs bda bdb bdc bdd bdo bdr bds boa bob boc bod boo bor bos bra brb brd bro brr brs bsa bsb bsc bsd bso bsr bss c-- caa cab cac cad cao car cas cba cbb cbc cbd cbo cbr cbs cca ccb ccc ccd cco ccr ccs cda cdb cdc cdd cdo cdr cds co- coa cob coc cod coo cor cos cra crb crc crd cro crr crs csa csb csc csd cso csr css daa dab dac dad dao dar das dba dbb dbc dbd dbo dbr dbs dca dcb dcc dcd dco dcr dcs dda ddb ddc ddd ddo ddr dds doa dob doc dod doo dor dos dra drb drc drd dro drr drs dsa dsb dsc dsd dso dsr dss oaa oab oac oad oao oar oas ob- oba obb obc obd obo obr obs oc- oca ocb occ ocd oco ocr ocs oda odb odc odd odo odr ods oo- ooa oob ooc ood ooo oor oos or- ora orb orc ord oro orr ors os- osa osb osc osd oso osr oss ra- raa rab rac rad rao rar ras rba rbb rbc rbd rbo rbr rbs rca rcb rcc rcd rco rcr rcs rda rdb rdc rdd rdo rdr rds roa rob roc rod roo ror ros rra rrb rrc rrd rrr rrs rsa rsb rsc rsd rso rsr rss saa sab sac sad sao sar sas sba sbb sbc sbd sbo sbr sbs sca scb scc scd sco scr scs sda sdb sdc sdd sdo sdr sds soa sob soc sod soo sor sos sr- sra srb src srd sro srr srs ss- ssa ssb ssc ssd sso ssr sss

a-do aaaa aaab aaac aaad aaar aaas aaba aabb aabc aabd aaca aacb aacc aacd aaco aacr aacs aada aadc aads aaoo aara aarc aard aaro aars aasa aasc aasd aass abaa abab abac abad abar abas abb- abba abbb abbo abbr abbs abca abcb abcc abcd abcr abcs abda abdo aboa abob abod aboo abor abos abra abrc abro abrs abs- absa absd abss acaa acab acac acad acar acas acba acca accc accd acco accs acda acdb acdc acds acoa acod acor acos acr- acra acrc acro acrr acrs acsa acsc acsd acss adaa adab adac adad adao adar adas adba adbc adcc adcs adda addc addd addo addr adds adob adoc adod adoo ador ados adra adro adrs adsa adso adsr adss aoba aoca aocs aora aorb aors aosd aoss arab arac arad arar aras arba arbs arc- arca arco arcs arda ardc ardo ards aroa arob arod aroo aror aros arr- arra arrc arro arrr arrs ars- arsa arsc arsd arso asaa asab asac asad asao asar asas asba asbo asc- asca ascb ascc asco ascr asda asdo asds asob asoc asod asor asos asra asrc asro asrs assa assc assd asso assr asss baaa baad baar baas baba babb babo babr babs bac- baca bacc baco bacs bada badb badd bado badr bads baos bar- bara barb barc bard baro barr bars basa basc baso bass bbad bbas bbbb bbbs bbdd bbdo bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcda bcds bcor bcos bcra bcrs bcsa bcsc bcss bd-r bdbc bddc bdos bdsd boab boac boad boar boas boba bobb bobo bobs boca boco bocs boda bodb bodo bods boob booc bood boor boos bor- bora bord boro borr bors bosa bosc boso boss brab brac brad brao bras brca brcb brda brdo brds broa brob broc brod broo bror bros brrr brrs brsb brsr bsaa bsac bsas bsbd bscs bsod bsos bsra bsrd bssc bssd c-bo c-cd caaa caab caac caas caba cabo cabs cac- caca cacc caco cacr cada cadc cadd cado cadr cads caod caor caos cara carb carc card caro carr cars casa casb casc casd caso casr cass cbac cbar cbbc cbbs cbca cbcc cbcr cbcs cbdb cbdc cbdo cbds cbrd cbsa cbsc ccaa ccab ccac ccad ccar ccas ccba ccbc ccca cccb cccc cccs ccdc ccdr ccds ccob ccoc ccod ccra ccrc ccrs ccsa ccsd ccss cd-r cdaa cdac cdad cdba cdcs cdda cddb cddr cdos cdrs cdss coad coas coba cobb cobo cobs coca coco coda codd cods coob cood coos cor- cora corb corc cord coro corr cors cosa cosc coso coss crab crac crar cras crbc crca crcc crcr crda crdc crob croc crod croo cror crsa crss csaa csab csac csao csar csas cscb cscc cscd csco cscr cscs csda csdb csdr csob csor csos csra csrc csrd csrs cssa cssd cssr d-bo daab daad daar daas daba dabb dabo dabs daca dacs dada dado dads daos dara darb darc dard daro darr dars dasa dasb dasc dasd dass dbar dbas dbcc dbcs dbos dbrs dbsa dbss dcas dcbc dcca dccb dccc dccs dcdb dcds dcos dcra dcsc dcss dddd ddoc ddrc ddss doab doar doas doba dobb dobs doca doco docs dod- doda dodd dodo dods doob dood door doos dora dorc dord doro dorr dors dosa doso doss draa drab drac drad drar dras drba drbc drca drda drob drod drra drrs drsa dsac dsba dsbc dscc dscr dscs dsda dsdr dsoa dsos dsrc dsrr dssa dssc oara oars oasc oass obad obas obba obbo obor obos obra obro obsd obsr obss ocab ocac ocad ocas ocbc occa occc ocds ocos ocra ocro ocrr ocrs ocsa odac odas odbo odda oddd odds odoo odor odos odra odso ooaa ooba oocr ooda oooo ooos oora oord oosa orab orac orad orao orar oras