a-a a-b a-c aaa aab aac aan aao aap aar aax ab- aba abb abc abn abo abp abr abx ac- aca acb acc acn aco acp acr acx an- ana anb anc ann ano anp anr anx aoa aob aoc aon aoo aop aor aox ap- apa apb apc apn apo app apr apx ar- ara arb arc arn aro arp arr arx ax- axa axn axo axp axr axx b-p baa bab bac ban bao bap bar bax bba bbb bbc bbn bbo bbp bbr bbx bca bcb bcc bcn bco bcp bcr bcx bna bnb bnc bnn bno bnp bnr bnx boa bob boc bon boo bop bor box bpa bpb bpc bpn bpo bpp bpr bpx bra brb brn bro brp brr brx bxb bxn bxo bxx c-- caa cab cac can cao cap car cax cba cbb cbc cbn cbo cbp cbr cbx cca ccb ccc ccn cco ccp ccr ccx cn- cna cnb cnc cnn cno cnp cnr cnx co- coa cob coc con coo cop cor cox cpa cpb cpc cpn cpo cpp cpr cpx cra crb crc crn cro crp crr crx cxc cxo cxp cxr cxx naa nab nac nan nao nap nar nax nba nbb nbc nbn nbo nbp nbr nbx nca ncb ncc ncn nco ncp ncr ncx nna nnb nnc nnn nno nnp no- noa nob noc non noo nop nor nox npa npb npc npn npo npp npr nra nrb nrc nrn nro nrp nrr nrx nxc oaa oab oac oan oao oap oar oax ob- oba obb obc obn obo obp obr obx oc- oca ocb occ ocn oco ocp ocr ocx on- ona onb onc onn ono onp onr onx oo- ooa oob ooc oon ooo oop oor oox op- opa opb opc opn opo opp opr opx or- ora orb orc orn oro orp orr orx ox- oxa oxb oxc oxn oxo oxx p-p paa pab pac pan pao pap par pax pba pbb pbc pbn pbo pbp pbr pbx pca pcb pcc pcn pco pcp pcr pcx pn- pna pnb pnc pnn pno pnp pnr pnx poa pob poc pon poo pop por pox ppa ppb ppc ppn ppo ppp ppr ppx pra prb prc prn pro prp prr prx pxc pxr ra- raa rab rac ran rao rap rar rax rba rbb rbc rbn rbo rbp rbr rbx rca rcb rcc rcn rco rcp rcr rcx rna rnb rnc rnn rno rnp rnr roa rob roc ron roo rop ror rox rpa rpb rpc rpn rpo rpp rpr rpx rra rrb rrc rrn rrp rrr rxp rxr xaa xac xan xap xar xbc xbr xbx xcb xcp xcr xcx xna xnc xno xoa xoc xon xoo xop xor xox xpa xpb xpc xpn xpo xpp xrc xrx xxo xxp xxx

-ana aaaa aaab aaac aaan aaap aaar aaba aabb aabc aabp aaca aacb aacc aacn aaco aacp aacr aana aanp aaon aaoo aapa aapc aapo aara aarc aaro aarp abaa abab abac aban abap abar abax abb- abba abbb abbo abbr abca abcb abcc abcn abcp abcr aboa abob abon aboo abor abox abpa abpc abpn abpp abpr abra abrc abro acaa acab acac acan acap acar acba acca accc acco accp acoa acon acop acor acpa acpr acr- acra acrc acro acrr ana- anaa anab anac anan anao anap anar anax anba anbb anbo anca ancc anco anna annb anno ano- anoa anon anor anox anp- anpa anpp anpr anrc aoba aoca aonb aono aopo aora aorb aorn apac apan apao apap apar apax apba apbr apca apcb apcc apcn apco apcr apna apno apo- apoc apon apoo apop apor apox appa appc appr appx apra aprc aprn apro arab arac aran arap arar arax arba arc- arca arco arna arno aroa arob aron aroo aror arpa arr- arra arrc arro arrr axan axar axo- axoa axon axxo ba-x baaa baan baar baba babb babo babr bac- baca bacc bacn baco bana banc bann bano banp banr baon bapa bapc bapp bar- bara barb barc barn baro barr barx bbbb bbox bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcor bcpp bcra bnoc bnor bnpp bnrr boab boac boan boar boba bobb bobo boca boco bona bonc bonn bono boob booc boon boop boor boox bopa bopp bor- bora born boro borr boxa bpcp bprc brab brac bran brao brax brca brcb brna brno broa brob broc bron broo bror brox brrr c-bo caaa caab caac caan caap caba cabo cac- caca cacc caco cacr cana canc cann cano canp caor capa capb capc capn capo capp capx cara carb carc carn caro carp carr carx caxa cbac cbar cbax cbbc cbca cbcc cbcn cbcp cbcr cbna cbox cbpc cbpp cbrn cbxa ccaa ccab ccac ccap ccar ccba ccbc ccbn ccca cccb cccc cccp ccna ccnb ccnc ccnp ccnr ccob ccoc ccpa ccpn ccpp ccpr ccra ccrc ccrp cnaa cnac cnap cnbc cnbp cnco cncp cnna cnpa cnrc cnrr coan coax coba cobb cobo coca coco cocp con- cona conc conn cono coob coon coop copa copo copp copr cor- cora corb corc corn coro corp corr coxa cpaa cpac cpan cpap cpbc cpca cpnb cpox cppa crab crac cran crap crar crax crbc crca crcc crcr crna crob croc cron croo crop cror crpc cxpo cxro cxxx naaa naab naac naan naar naba nabc nabo naca nacc naco nacp nan- nana nanb nann nano nanp naoc naor napa napb napo napp nara narc narn naro narp narr narx nbaa nbap nbar nbbc nbbo nbca nbcc nbco nbpa nbpp ncaa ncac ncap ncar ncba ncbc ncca nccc nccn nccp nccr ncna ncnc ncoa ncoc ncor ncpa ncpc ncra ncrc ncrp nnnn nnpr noaa noac noap noba nobc nobo noco non- nona nonn nono nonx noo- noob noon nooo noop noor nor- nora norb norc norn noro norr noxa npac npap npca npcc nppa nppc npra nrab nrap nrca nrna nroc nron nrpc nrpn nrrc oara oban obba obbo obon obor