a-a a-b a-c aaa aab aac aaf aah aan aao aar ab- aba abb abc abf abh abn abo abr ac- aca acb acc acf ach acn aco acr af- afa afb afc aff afh afn afo afr aha ahb ahc ahf ahh ahn aho ahr an- ana anb anc anf anh ann ano anr aoa aob aoc aof aoh aon aoo aor ar- ara arb arc arf arh arn aro arr baa bab bac baf bah ban bao bar bba bbb bbc bbf bbh bbn bbo bbr bca bcb bcc bcf bch bcn bco bcr bfa bfb bfc bff bfh bfn bfo bfr bha bhb bhc bhf bhh bho bhr bna bnb bnc bnf bnn bno bnr boa bob boc bof boh bon boo bor bra brb brf brh brn bro brr c-- caa cab cac caf cah can cao car cba cbb cbc cbf cbh cbn cbo cbr cca ccb ccc ccf cch ccn cco ccr cfa cfb cfc cff cfh cfn cfo cfr ch- cha chb chc chf chh chn cho chr cn- cna cnb cnc cnf cnh cnn cno cnr co- coa cob coc cof coh con coo cor cra crb crc crf crh crn cro crr faa fab fac faf fah fan fao far fba fbb fbc fbf fbh fbn fbo fbr fca fcb fcc fcf fcn fco fcr ffa ffc fff ffh ffn ffo ffr fha fhb fhc fhf fhh fhn fho fhr fna fnb fnc fnf fnh fnn fnr foa fob foc fof foh fon foo for fra frb frc frf frh frn fro frr haa hab hac haf hah han hao har hba hbb hbc hbf hbh hbn hbo hbr hca hcb hcc hcf hch hcn hco hcr hfa hfb hfc hff hfh hfn hfo hfr hha hhb hhc hhf hhh hhn hho hhr hna hnb hnc hnf hnh hnn hno hoa hob hoc hof hoh hon hoo hor hr- hra hrb hrc hrf hrh hrn hro hrr naa nab nac naf nah nan nao nar nba nbb nbc nbf nbn nbo nbr nca ncb ncc ncf nch ncn nco ncr nfa nfb nfc nff nfn nfo nfr nha nhb nhc nhf nhh nhn nhr nna nnb nnc nnf nnh nnn nno no- noa nob noc nof noh non noo nor nra nrb nrc nrf nrn nro nrr oaa oab oac oaf oah oan oao oar ob- oba obb obc obf obh obn obo obr oc- oca ocb occ ocf och ocn oco ocr of- ofa ofb ofc off ofn ofo ofr oha ohc ohf ohh ohn oho ohr on- ona onb onc onf onh onn ono onr oo- ooa oob ooc oof ooh oon ooo oor or- ora orb orc orf orh orn oro orr ra- raa rab rac raf rah ran rao rar rba rbb rbc rbf rbh rbn rbo rbr rca rcb rcc rcf rch rcn rco rcr rfa rfb rfc rff rfh rfn rfo rfr rh- rha rhb rhc rhf rhh rhn rho rhr rna rnb rnc rnh rnn rno rnr roa rob roc rof roh ron roo ror rra rrb rrc rrf rrh rrn rrr

-ana a-ha aaaa aaab aaac aaaf aaah aaan aaar aaba aabb aabc aabh aaca aacb aacc aacf aach aacn aaco aacr aafa aafb aafc aaff aaha aana aaon aaoo aara aarc aaro abaa abab abac abaf aban abar abb- abba abbb abbo abbr abca abcb abcc abcf abch abcn abcr abff abha abho abhr aboa abob abof aboh abon aboo abor abra abrc abro acaa acab acac acan acar acba acca accc accf acch acco acfc acha achh acho achr acoa acoh acon acor acr- acra acrc acro acrr afaa afan afao afar afca afcb afcc afch affa affc affo afoa afoo afor afr- afra afrc afro ahab ahac ahah ahar ahfa ahha ahoa ahor ahra ahrc ahrr ana- anaa anab anac anah anan anao anar anba anbb anbo anca ancc anco anfa anfo anha anna annb anno ano- anoa anon anor anrc aoah aoba aoca aonb aono aora aorb aorn arab arac araf arah aran arar arba arbh arc- arca arch arco arfa arfb arfc arff arh- arna arno aroa arob aron aroo aror arr- arra arrc arrh arro arrr baaa baaf baah baan baar baba babb babo babr bac- baca bacc bach bacn baco bafc baff bafo baha bahn baho bahr bana banc banh bann bano banr baoh baon bar- bara barb barc barf barh barn baro barr bbbb bbch bbfc bbfn bbrc bcaa bcar bcbc bcca bccc bcfc bcof bcor bcra bfca bhan bhao bhar bhca bhcc bhff bhor bhra bnoc bnor bnrr boab boac boan boar boba bobb bobo boca boch boco bofa boff bofh boha bohn boho bohr bona bonc bonn bono boob booc boof booh boon boor bor- bora borf borh born boro borr brab brac braf brah bran brao brca brcb brfc brna brno broa brob broc broh bron broo bror brrr c-bo caaa caab caac caaf caah caan caba cabf cabo cac- caca cacc cach caco cacr cafa cafb cafc caff caha cahn cana canc canh cann cano caor cara carb carc carf carn caro carr cbac cbar cbbc cbca cbcc cbcn cbcr cbfb cbfc cbha cbna cbrh cbrn ccaa ccab ccac ccaf ccar ccba ccbc ccbn ccca cccb cccc cccf ccfa ccfc ccff ccha cchr ccna ccnb ccnc ccnf ccnr ccob ccoc ccra ccrc ccrf cfaa cfab cfac cfao cfar cfbc cfbn cfbr cfca cfcb cfcf cfcn cfco cffb cffr cfnb cfnr cfoa cfor cfra cfrb cfrn chaa chab chac chaf chah chan chao char chca chch chfa chfc chfr chha chnb chnc chno chnr choc choh chon choo chor chra chrb chrc chrf chrn chro chrr cnaa cnac cnbc cnco cnfa cnna cnoh cnrc cnrr coan coba cobb cobh cobo coca coch coco cofc coff coha cohn coho con- cona conc conf conn cono coob coof cooh coon cor- cora corb corc corf corn coro corr crab crac craf cran crar crbc crca crcc crcr crfc crna crob croc croh cron croo