a-a a-b a-c aaa aab aac aan aao aar aas aax ab- aba abb abc abn abo abr abs abx ac- aca acb acc acn aco acr acs acx an- ana anb anc ann ano anr ans anx aoa aob aoc aon aoo aor aos aox ar- ara arb arc arn aro arr ars arx as- asa asb asc asn aso asr ass asx ax- axa axn axo axr axs axx baa bab bac ban bao bar bas bax bba bbb bbc bbn bbo bbr bbs bbx bca bcb bcc bcn bco bcr bcs bcx bna bnb bnc bnn bno bnr bns bnx boa bob boc bon boo bor bos box bra brb brn bro brr brs brx bsa bsb bsc bsn bso bsr bss bsx bxb bxn bxo bxx c-- caa cab cac can cao car cas cax cba cbb cbc cbn cbo cbr cbs cbx cca ccb ccc ccn cco ccr ccs ccx cn- cna cnb cnc cnn cno cnr cns cnx co- coa cob coc con coo cor cos cox cra crb crc crn cro crr crs crx csa csb csc csn cso csr css csx cxc cxo cxr cxs cxx naa nab nac nan nao nar nas nax nba nbb nbc nbn nbo nbr nbs nbx nca ncb ncc ncn nco ncr ncs ncx nna nnb nnc nnn nno nns no- noa nob noc non noo nor nos nox nra nrb nrc nrn nro nrr nrs nrx nsa nsb nsc nsn nso nsr nss nsx nxc oaa oab oac oan oao oar oas oax ob- oba obb obc obn obo obr obs obx oc- oca ocb occ ocn oco ocr ocs ocx on- ona onb onc onn ono onr ons onx oo- ooa oob ooc oon ooo oor oos oox or- ora orb orc orn oro orr ors orx os- osa osb osc osn oso osr oss osx ox- oxa oxb oxc oxn oxo oxx ra- raa rab rac ran rao rar ras rax rba rbb rbc rbn rbo rbr rbs rbx rca rcb rcc rcn rco rcr rcs rcx rna rnb rnc rnn rno rnr rns roa rob roc ron roo ror ros rox rra rrb rrc rrn rrr rrs rsa rsb rsc rsn rso rsr rss rsx rxr rxs saa sab sac san sao sar sas sax sba sbb sbc sbn sbo sbr sbs sbx sca scb scc scn sco scr scs scx sna snb snc snn sno snr sns soa sob soc son soo sor sos sox sr- sra srb src srn sro srr srs srx ss- ssa ssb ssc ssn sso ssr sss ssx sxc sxn sxs xaa xac xan xar xas xbc xbr xbx xcb xcr xcx xna xnc xno xns xoa xoc xon xoo xor xos xox xrc xrx xsa xsb xsc xss xxo xxx

-ana aaaa aaab aaac aaan aaar aaas aaba aabb aabc aaca aacb aacc aacn aaco aacr aacs aana aaon aaoo aara aarc aaro aars aasa aasc aass abaa abab abac aban abar abas abax abb- abba abbb abbo abbr abbs abca abcb abcc abcn abcr abcs aboa abob abon aboo abor abos abox abra abrc abro abrs abs- absa abss acaa acab acac acan acar acas acba acca accc acco accs acoa acon acor acos acr- acra acrc acro acrr acrs acsa acsc acss ana- anaa anab anac anan anao anar anas anax anba anbb anbo anca ancc anco anna annb anno anns ano- anoa anon anor anos anox anrc ansa anso aoba aoca aocs aonb aono aora aorb aorn aors aoss arab arac aran arar aras arax arba arbs arc- arca arco arcs arna arno arns aroa arob aron aroo aror aros arr- arra arrc arro arrr arrs ars- arsa arsc arso asaa asab asac asan asao asar asas asba asbo asc- asca ascb ascc asco ascr ascx asnc asno asob asoc ason asor asos asra asrc asro asrs assa assc assn asso assr asss axan axar axo- axoa axon axos axxo ba-x baaa baan baar baas baba babb babo babr babs bac- baca bacc bacn baco bacs bana banc bann bano banr bans baon baos bar- bara barb barc barn 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 bcsn bcss bnas bnoc bnor bnrr bnss boab boac boan boar boas boba bobb bobo bobs boca boco bocs bona bonc bonn bono bons boob booc boon boor boos boox bor- bora born boro borr bors bosa bosc bosn boso boss boxa brab brac bran brao bras brax brca brcb brna brno brns broa brob broc bron broo bror bros brox brrr brrs brsb brsr bsaa bsac bsas bscs bsns bson bsos bsra bssc c-bo caaa caab caac caan caas caba cabo cabs cac- caca cacc caco cacr cana canc cann cano cans caor caos cara carb carc carn caro carr cars carx casa casb casc caso casr cass caxa cbac cbar cbax cbbc cbbs cbca cbcc cbcn cbcr cbcs cbna cbox cbrn cbsa cbsc cbsn cbxa ccaa ccab ccac ccar ccas ccba ccbc ccbn ccca cccb cccc cccs ccna ccnb ccnc ccnr ccns ccob ccoc ccra ccrc ccrs ccsa ccsn ccss cnaa cnac cnas cnbc cnco cnna cnrc cnrr cnsa cnss coan coas coax coba cobb cobo cobs coca coco con- cona conc conn cono cons coob coon coos cor- cora corb corc corn coro corr cors cosa cosc coso coss coxa crab crac cran crar cras crax crbc crca crcc crcr crna crns crob croc cron 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 naaa naab naac naan naar naas naba nabc nabo nabs naca nacc naco nacs nan- nana nanb nann nano nans naoc naor naos nara narc narn naro narr nars narx nas- nasa nasb nasc naso nasr nass nbaa nbar nbas nbbc nbbo nbca nbcc nbco nbcs ncaa ncac ncar ncba ncbc ncbs