a-a a-b a-c aaa aab aac aao aar aas aax ab- aba abb abc abo abr abs abx ac- aca acb acc aco acr acs acx aoa aob aoc aoo aor aos aox ar- ara arb arc aro arr ars arx as- asa asb asc aso asr ass asx ax- axa axo axr axs axx baa bab bac bao bar bas bax bba bbb bbc bbo bbr bbs bbx bca bcb bcc bco bcr bcs bcx boa bob boc boo bor bos box bra brb bro brr brs brx bsa bsb bsc bso bsr bss bsx bxb bxo bxx c-- caa cab cac cao car cas cax cba cbb cbc cbo cbr cbs cbx cca ccb ccc cco ccr ccs ccx co- coa cob coc coo cor cos cox cra crb crc cro crr crs crx csa csb csc cso csr css csx cxc cxo cxr cxs cxx oaa oab oac oao oar oas oax ob- oba obb obc obo obr obs obx oc- oca ocb occ oco ocr ocs ocx oo- ooa oob ooc ooo oor oos oox or- ora orb orc oro orr ors orx os- osa osb osc oso osr oss osx ox- oxa oxb oxc oxo oxx ra- raa rab rac rao rar ras rax rba rbb rbc rbo rbr rbs rbx rca rcb rcc rco rcr rcs rcx roa rob roc roo ror ros rox rra rrb rrc rrr rrs rsa rsb rsc rso rsr rss rsx rxr rxs saa sab sac sao sar sas sax sba sbb sbc sbo sbr sbs sbx sca scb scc sco scr scs scx soa sob soc soo sor sos sox sr- sra srb src sro srr srs srx ss- ssa ssb ssc sso ssr sss ssx sxc sxs xaa xac xar xas xbc xbr xbx xcb xcr xcx xoa xoc xoo xor xos xox xrc xrx xsa xsb xsc xss xxo xxx

aaaa aaab aaac aaar aaas aaba aabb aabc aaca aacb aacc aaco aacr aacs aaoo aara aarc aaro aars aasa aasc aass abaa abab abac abar abas abax abb- abba abbb abbo abbr abbs abca abcb abcc abcr abcs aboa abob aboo abor abos abox abra abrc abro abrs abs- absa abss acaa acab acac acar acas acba acca accc acco accs acoa acor acos acr- acra acrc acro acrr acrs acsa acsc acss aoba aoca aocs aora aorb aors aoss arab arac arar aras arax arba arbs arc- arca arco arcs aroa arob aroo aror aros arr- arra arrc arro arrr arrs ars- arsa arsc arso asaa asab asac asao asar asas asba asbo asc- asca ascb ascc asco ascr ascx asob asoc asor asos asra asrc asro asrs assa assc asso assr asss axar axo- axoa axos axxo ba-x baaa baar baas baba babb babo babr babs bac- baca bacc baco bacs baos bar- bara barb barc baro barr bars barx basa basc baso bass bbas bbbb bbbs bbox bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcor bcos bcra bcrs bcsa bcsc bcss boab boac boar boas boba bobb bobo bobs boca boco bocs boob booc boor boos boox bor- bora boro borr bors bosa bosc boso boss boxa brab brac brao bras brax brca brcb broa brob broc broo bror bros brox brrr brrs brsb brsr bsaa bsac bsas bscs bsos bsra bssc c-bo caaa caab caac caas caba cabo cabs cac- caca cacc caco cacr caor caos cara carb carc caro carr cars carx casa casb casc caso casr cass caxa cbac cbar cbax cbbc cbbs cbca cbcc cbcr cbcs cbox cbsa cbsc cbxa ccaa ccab ccac ccar ccas ccba ccbc ccca cccb cccc cccs ccob ccoc ccra ccrc ccrs ccsa ccss coas coax coba cobb cobo cobs coca coco coob coos cor- cora corb corc coro corr cors cosa cosc coso coss coxa crab crac crar cras crax crbc crca crcc crcr crob croc croo cror crsa crss csaa csab csac csao csar csas cscb cscc csco cscr cscs csob csor csos csox csra csrc csrs cssa cssr cxro cxxx oara oars oasc oass obas obba obbo obor obos obox obra obro obsr obss ocab ocac ocas ocbc occa occc ocos ocra ocro ocrr ocrs ocsa ooaa ooba oocr oooo ooos oora oosa orab orac orao orar oras orba orbb orbo orbs orca orco orcs oro- oror oros orra orro orrs orsa orso osar osas osba osca oscc osco osoo osor osos osro ossa ossb osso oxa- oxo- oxos oxox oxxo raab raas raba rabb rabo rabs rac- raca racc raco racs raob raoc raos rara rarb raro rars rasa rasc raso rass raxa rbbb rbbr rbbs rbss rcac rcas rcbc rcbo rccb rccc rccs rcos rcsa rcsc rcss roab roar roas rob- roba robb robo robs roca rocc roco rocs roob roor roos roox rora rorc roro rosa rosc roso ross roxa roxo rras rrrr rsaa rscc rscs rsos rssa s-os sa-c sa-x saab saac saar saas saba sabb sabc sabo sabr sabs saca sacc saco sacr sacs saor saos sara sarc saro sarr sars sasa sasc saso sass saxa saxo sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbor sbsa scaa scab scac scar scas scba sccc sccs scob scoo scor scox scr- scra scrc scrs scsa scsc scso scsr soar soas soba sobo sobr sobs soca soco socr socs socx soor soos sora sorb soro sorr sors sosa soso soss soxs sras srbc srcc sros ssaa ssab ssac ssao ssas ssbr ssca sscc sscs ssoc ssra ssrc ssrs sssa sssb sssc ssss xaar xaos xara xbar xbox xbra xcas xobc xoca xoco xoro xors xosa xoxo xxxo xxxx

-aaa- a-box aaaas aaaoc aaarc aaasa aaass aabaa aabba aabra aacbc aacos aacsa aacsb aacss aasra abaab ababa ababs abaca abaco abacs abara abasa abass abbac abbar abbas abbos abbrs abcas abccc aboab abobo abora aborc aboso abrac abrar abras absar acaca acacb acar- acara acars acass accas accra acoss acrab acro- acrob acros aoos ar-ab ara-c arab- araba arabo arabs araca araco arara arars arass araxa arbab