-er a-a a-b a-c aaa aab aac aae aak aar ab- aba abb abc abe abk abr ac- aca acb acc ace ack acr aea aeb aec aee aek aer aka akb akc ake akk akr ar- ara arb arc are ark arr baa bab bac bae bak bar bba bbb bbc bbe bbk bbr bca bcb bcc bce bck bcr be- bea beb bec bee bek ber bka bkb bkc bke bkk bkr bra brb bre brk brr c-- caa cab cac cae cak car cba cbb cbc cbe cbk cbr cca ccb ccc cce cck ccr ce- cea ceb cec cee cek cer cka ckb ckc cra crb crc cre crk crr eaa eab eac eae eak ear eba ebb ebc ebe ebk ebr ec- eca ecb ecc ece eck ecr eea eeb eec eee eek eer eka ekb ekc eke ekr era erb erc ere erk err ka- kaa kab kac kae kak kar kba kbb kbc kbe kbk kbr kca kcb kcc kce kck kcr ke- kea keb kec kee kek ker kkb kkc kke kkk kkr kra krc krk krr ra- raa rab rac rae rak rar rba rbb rbc rbe rbk rbr rca rcb rcc rce rcr re- rea reb rec ree rek rer rkb rkc rke rkk rra rrb rrc rrk rrr

a-ak a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aack aacr aaea aaec aaka aake aara aarc aare abaa abab abac abae abak abar abb- abba abbb abbe abbr abca abcb abcc abcr abec abee aber abra abrc acaa acab acac acae acar acba acca accc acce ace- acea acec acek acer acke acr- acra acrc acre acrr aeac aecb aeer aeka aer- aera aerc akaa akae akar akca akee aker akka akr- akra akre arab arac arae arak arar arba arbe arc- arca arce area arec aree arek arka arke arr- arra arrc arre arrk arrr baaa baak baar baba babb babe babr bac- baca bacc bace back baek baer bak- baka bake bakr bar- bara barb barc bare bark barr bbbb bbeb bbrc bcaa bcar bcbc bcca bccc bcec bcer bcra beak bear beba bebb bebe beca beck beeb beek beer beka beke bera berc bere berk berr brab brac brae brak brca brcb brce brea breb brec bree brek brer brka brkb brrr caaa caab caac caba cabe cac- caca cacc cace cack cacr caec caer caka cake cara carb carc care cark carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cber cbka cbkr cbre ccaa ccab ccac ccar ccba ccbc ccca cccb cccc ccee ccra ccrc ccre ceac cear ceba cec- ceca cece ceeb ceec ceke cer- cera cerc cere ckac ckbc ckbe ckck cker ckrc crab crac crar crbc crca crcc crce crcr cre- crea creb crec cree crkc eaba eaca eacc eaec eara earb eare ebac ebba ebbc ebbr ebcc eber ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce ecka ecra ecrc ecrr eeca eeea eeee eeka eeke eera eerc eka- ekab ekeb ekek eker ekka erba erbb erbe erca ercc erce ereb erec erer erke erra errc erre kaaa kaab kaak kaar kaba kabb kabc kabe kabr kacb kacc kace kaer kaka kakc kake kakk kara karb kare kark karr kbaa kbab kbac kbae kbak kbar kbba kbbb kbbc kbbe kbbk kbbr kbca kbcb kbce kbck kbcr kbeb kbec kbee kbek kber kbkb kbkk kbkr kbra kbrb kbrc kbre kbrk kcaa kcab kcac kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kcea kceb kcec kcee kckc kckk kckr kcrc kcrr kea- keak kear keba kebb kebc kebe kebr keca keck kecr keek keer keka kekb kekc keke ker- kera kerb kerc kere kerk kerr kkaa kkac kkar kkba kkbb kkbe kkbr kkcb kkck kkcr kkea kkkk kkrb kkrc kkre kkrk kkrr krab krac krae krak krar krba krbb krbe krbk krbr krca krcb krcc krce krea kreb krec kree krek krka krkc krke krkk krkr krrb krrc krre krrk krrr raab raak raba rabb rabe rabk rac- raca racc race rack raec raer raka rake rakk rara rarb rare rark rbbb rbbr rcac rcbc rccb rccc rea- reac reae reak rear reba rebb rebe rebk reca recc rece reck recr reeb reek reka reke rera rere rrrr

-aaa- aaace aaaee aaarc aabaa aabba aabra aacbc aaker aakre abaab ababa ababe abaca aback abaer abaka abake abara abare abbac abbar abccc abear abeba abebe abece abeer abekr abera abere aberr abkar abrac abrak abrar abrek acaca acacb acack acake acar- acara acare accra aceae acera acerb ackee acker acrab acrea acree aeaea aebbe aka-e akaba akare akbar akce akera akker akkra akrak akrar ar-ab ara-c arab- araba arabe araca arace arack araea arake arara arare arbab arbar arbee arber arbre arcae arcee areae arear areca areek areka areke arere arkar arrak arrea b-r-k baabe baake babak babar babec babee babek baber babka babra bacab bacar bacca bacea back- backa backe bakar bakea baker bakka bakke bakra bakrc baraa barab barac barak barar barba barbe barca barce barea barek barer bark- barka barke barra barre bbbee bbear be-er beack beara beare bebar bebek beber bebra becak becca becke beeac beebe beeke bekaa beker bekka bekke bekra berak berar berba berbe berca berck berea berec berek berk- berka berke berra berre braak braca bracc brace brack brake break breba brece breck breek breer breke brera brere brrar brrrr c-a-c ca-ca caaba caare caber cabra cabre cacak caec- caeca caere cakra caraa carab carac carak carb- carck carea carek carer cark- carra carre ccccc ceace ceara ceare cearr cebec ceber cecka ceeac ceere cerae cerak cerc- cerca cerce cerea cerec cerer cerka cerke cerre craba crabb crace crack craer crake crare creak crear crebe crece creek creer creke eaker earar ebara ebber ecara ecare ecker eecca eecke eeeee ekker erace erbaa erbar erbbe erber ercea ereac erear erere erkak erkec k-car k-rab kaaba kabaa kabab kabak kabar kabba kaber kacar kacee kacer kaera kakae kakar kakka kakke