a-a a-b a-c aaa aab aac aad aak aan aar ab- aba abb abc abd abk abn abr ac- aca acb acc acd ack acn acr ad- ada adb adc add adk adn adr aka akb akc akd akk akn akr an- ana anb anc and ank ann anr ar- ara arb arc ard ark arn arr baa bab bac bad bak ban bar bba bbb bbc bbd bbk bbn bbr bca bcb bcc bcd bck bcn bcr bda bdb bdc bdd bdk bdr bka bkb bkc bkk bkn bkr bna bnb bnc bnd bnk bnn bnr bra brb brd brk brn brr c-- caa cab cac cad cak can car cba cbb cbc cbd cbk cbn cbr cca ccb ccc ccd cck ccn ccr cda cdb cdc cdd cdk cdn cdr cka ckb ckc ckd cn- cna cnb cnc cnd cnn cnr cra crb crc crd crk crn crr daa dab dac dad dak dan dar dba dbb dbc dbd dbk dbn dbr dca dcb dcc dcd dck dcn dcr dda ddb ddc ddd ddk ddn ddr dka dkb dkc dkk dkr dna dnb dnc dnd dnk dnn dnr dra drb drc drd drk drn drr ka- kaa kab kac kad kak kan kar kba kbb kbc kbd kbk kbn kbr kca kcb kcc kcd kck kcn kcr kda kdb kdc kdk kdr kkb kkc kkk kkn kkr kn- kna knc knd knk knn knr kra krc krd krk krn krr naa nab nac nad nak nan nar nba nbb nbc nbd nbk nbn nbr nca ncb ncc ncd nck ncn ncr nda ndb ndc ndd ndk ndn ndr nka nkc nkk nkn nkr nna nnb nnc nnk nnn nra nrb nrc nrd nrk nrn nrr ra- raa rab rac rad rak ran rar rba rbb rbc rbd rbk rbn rbr rca rcb rcc rcd rcn rcr rda rdb rdc rdd rdn rdr rkb rkc rkk rna rnb rnc rnd rnn rnr rra rrb rrc rrd rrk rrn rrr

-ana a-ak aaaa aaab aaac aaad aaan aaar aaba aabb aabc aabd aaca aacb aacc aacd aack aacn aacr aada aadc aaka aana aand aara aarc aard abaa abab abac abad abak aban abar abb- abba abbb abbr abca abcb abcc abcd abcn abcr abda abra abrc acaa acab acac acad acan acar acba acca accc accd acda acdb acdc ackd acr- acra acrc acrr adaa adab adac adad adak adan adar adba adbc adcc adda addc addd addn addr adna adra akaa akan akar akca akdn akka akna akr- akra ana- anaa anab anac anad anak anan anar anba anbb anca ancc and- anda andr ank- anka anna annb anrc arab arac arad arak aran arar arba arc- arca arda ardc arka arna arnd arnk arr- arra arrc arrk arrr baaa baad baak baan baar baba babb babr bac- baca bacc back bacn bada badb badd badr bak- baka bakr bana banc band bank bann banr bar- bara barb barc bard bark barn barr bbad bbbb bbdd bbrc bcaa bcar bcbc bcca bccc bcda bcra bd-r bdbc bddc bdna bnrr brab brac brad brak bran brca brcb brda brka brkb brna brrr c-cd caaa caab caac caan caba cac- caca cacc cack cacr cada cadc cadd cadr caka cana canc cand cank cann cara carb carc card cark carn carr cbac cbar cbbc cbca cbcc cbcn cbcr cbdb cbdc cbdn cbka cbkn cbkr cbna cbnd cbrd cbrn ccaa ccab ccac ccad ccar ccba ccbc ccbn ccca cccb cccc ccdc ccdn ccdr ccna ccnb ccnc ccnr ccra ccrc cd-r cdaa cdac cdad cdba cdda cddb cddr cdna cdnb cdnc ckac ckan ckbc ckck cknb cknc ckrc ckrd cnaa cnac cnbc cnda cndd cnna cnrc cnrr crab crac cran crar crbc crca crcc crcr crda crdc crkc crna d-na daab daad daan daar daba dabb daca dada daka dana dand dank dann danr dara darb darc dard dark darn darr dbar dbcc dbrn dcbc dcca dccb dccc dcdb dcra dcrk dddd ddrc dkba dkdc dnaa dnab dnac dnad dnan dnrc draa drab drac drad drak drar drba drbc drca drda drna drra kaaa kaab kaak kaan kaar kaba kabb kabc kabd kabr kacb kacc kacd kad- kada kadd kadr kaka kakc kakk kakn kana kanb kand kann kara karb kard kark karn karr kbaa kbab kbac kbad kbak kbar kbba kbbb kbbc kbbd kbbk kbbr kbca kbcb kbck kbcr kbdb kbdn kbdr kbkb kbkk kbkr kbna kbnd kbnn kbnr kbra kbrb kbrc kbrd kbrk kbrn kcaa kcab kcac kcad kcar kcba kcbc kcbd kcbk kcbr kcca kccb kccc kccd kcck kccr kcda kcdc kcdd kcdr kckc kckk kckn kckr kcnb kcnd kcnr kcrc kcrn kcrr kdaa kdab kdac kdad kdak kdar kdbb kdbn kdbr kdca kdcc kdcd kdcr kddb kddc kddd kddk kddr kdka kdkb kdkd kdkk kdkn kdkr kdna kdnd kdnk kdnn kdnr kdrb kkaa kkac kkan kkar kkba kkbb kkbd kkbn kkbr kkcb kkcd kkck kkcn kkcr kkda kkdc kkdd kkkk kknb kknd kknn kkrb kkrc kkrk kkrn kkrr knaa knab knac knan knar knba knbb knbc knbn knbr knca kncb knck kncn kncr knda kndb kndc kndd kndk kndn kndr knkk knnb knnd knnk knnr knrb knrk krab krac krad krak kran krar krba krbb krbd krbk krbr krca krcb krcc krcd krcn krda krdc krdd krdr krka krkc krkd krkk krkn krkr krna krnb krnd krnk krnn krrb krrc krrk krrn krrr naaa naab naac naad naan naar naba nabc nabk naca nacc nacd nack nada nadc nadk nadr naka nan- nana nanb nand nann nara narc nard nark narn narr nbaa nbad nbak nbar nbbc nbca nbcc ncaa ncac ncar ncba ncbc ncca nccc nccn nccr ncda ncdc ncdn ncdr ncna ncnc ncnd ncra ncrc ndaa ndak ndcc nddb ndna ndrc nndb nnnn nrab nrca nrdc nrna nrrc nrrd raab raad raak raan raba rabb rabk rac- raca racc rack rada radc radd radr raka rakk rana ranc rand rank rann rara rarb rark rbbb rbbr rcac rcbc rccb rccc rcdc rcnr rcrd rdac rdna rnbr