a-be a-do aaaa aaab aaac aaad aaae aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aaco aacr aada aadc aade aaea aaec aaoe aaoo aara aarc aard aare aaro abaa abab abac abad abae abar abb- abba abbb abbe abbo abbr abca abcb abcc abcd abcr abda abdo abec abed abee aber aboa abob abod aboo abor abra abrc abro acaa acab acac acad acae acar acba acca accc accd acce acco acda acdb acdc acde ace- acea acec aced acer acoa acod acoe acor acr- acra acrc acre acro acrr adaa adab adac adad adae adao adar adba adbc adcc adda addc addd adde addo addr adea adeb adee adeo ader adob adoc adod adoe adoo ador adra adre adro aeac aecb aede aeer aer- aera aerc aerd aero aoba aoca aoce aora aorb arab arac arad arae arar arba arbe arc- arca arce arco arda ardc arde ardo area arec ared aree areo aroa arob arod aroe aroo aror arr- arra arrc arre arro arrr baaa baad baar baba babb babe babo babr bac- baca bacc bace baco bada badb badd bade bado badr baed baer bar- bara barb barc bard bare baro barr bbad bbbb bbdd bbdo bbeb bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcor bcra bd-r bdbc bddc bead bear beba bebb bebe bebo beca beda bede bedo beeb beed beer beo- beod beor bera berc berd bere bero berr boab boac boad boar boba bobb bobe bobo boca boce boco boda bodb bode bodo boea boec boee boeo boer boob booc bood booe boor bor- bora bord bore boro borr brab brac brad brae brao brca brcb brce brda brdo brea breb brec bred bree breo brer broa brob broc brod broe broo bror brrr c-bo c-cd caaa caab caac caba cabe cabo cac- caca cacc cace caco cacr cada cadc cadd cade cado cadr caec caer caod caor cara carb carc card care caro carr cbac cbar cbbc cbca cbcc cbce cbcr cbdb cbdc cbdo cbea cbec cbee cber cbrd cbre ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc ccdc ccdr cced ccee ccob ccoc ccod ccra ccrc ccre cd-e cd-r cdaa cdac cdad cdba cdda cddb cddr cdec cder cdre ceac cead cear ceba cec- ceca cece ceco ceda cedd cede cedo ceeb ceec ceor cer- cera cerc cerd cere cero coad coba cobb cobe cobo coca coce coco coda codd code coed coob cood cor- cora corb corc cord core coro corr crab crac crar crbc crca crcc crce crcr crda crdc cre- crea creb crec cred cree creo crob croc crod croe croo cror d-bo daab daad daae daar daba dabb dabo daca dace dada dade dado daeb daer dara darb darc dard dare daro darr dbar dbcc dcbc dcca dccb dccc dcdb dcra dddd ddoc ddrc ddre deac dead deae dear deba debe dec- deca decc decd dece deco deda dedd dede dedo deeb deed deer deor der- dera derb derc dere dero derr doab doae doar doba dobb dobe doca doce doco dod- doda dodd dode dodo doea doer doob dood door dora dorc dord dore doro dorr draa drab drac drad drar drba drbc drca drda drea dred dree drob drod drra eaba eaca eacc eada eadb eadd eaec eara earb eard eare earo ebac ebba ebbc ebbo ebbr ebcc ebed eber eboe eboo ebor ebro ecaa ecac ecad ecao ecar ecbc ecbe ecca eccb eccc ecce ecco ecdc eced eco- ecod ecra ecrc ecrr edac edad edar edca edda eddc edde eddo ede- edea eder edoc edod edra eeca eede eeea eeee eeoc eera eerc eero eocd eode eora eore erad erba erbb erbe erca ercc erce erda erde ereb erec ered erer erob eroc erod eroe eroo erra errc erre erro o-eo oade oaer oara oare obad obba obbo obea obec obed ober oboe obor obra obre obro ocab ocac ocad ocbc occa occc oce oced ocee ocra ocre ocro ocrr odac odbo odda oddd odea oded odeo oder odoo odor odra oec- oeca oecc oedo oeec oera oere ooaa ooba oobe oocr ooda ooer oooo oora oord oore orab orac orad orae orao orar orba orbb orbe orbo orca orce orco orda orde ordo ore- orea oreb orec ored oreo orer oro- oroe oror orra orro raab raad raba rabb rabe rabo rac- raca racc race raco rada radc radd rade rado radr raec raed raer raob raoc rara rarb rare raro rbbb rbbr rcac rcbc rcbo rccb rccc rcdc rcde rcrd rdac rder rdoc rea- reac read reae reao rear reba rebb rebe rebo reca recc recd rece recr reda redc redd rede redo redr reeb reed reod rera rerd rere rero roab road roar rob- roba robb robe robo roca rocc roce roco roda rodd rode rodo roea roed roer roob rood roor rora rorc rore roro rrad rred rrrr