a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aaco aacr aaea aaec aaoe aaoo aara aarc aare aaro abaa abab abac abae abar abb- abba abbb abbe abbo abbr abca abcb abcc abcr abec abee aber aboa abob aboo abor abra abrc abro acaa acab acac acae acar acba acca accc acce acco ace- acea acec acer acoa acoe acor acr- acra acrc acre acro acrr aeac aecb aeer aer- aera aerc aero aoba aoca aoce aora aorb arab arac arae arar arba arbe arc- arca arce arco area arec aree areo aroa arob aroe aroo aror arr- arra arrc arre arro arrr baaa baar baba babb babe babo babr bac- baca bacc bace baco baer bar- bara barb barc bare baro barr bbbb bbeb bbrc bcaa bcar bcbc bcca bccc bcec bcer bcor bcra bear beba bebb bebe bebo beca beeb beer beo- beor bera berc bere bero berr boab boac boar boba bobb bobe bobo boca boce boco boea boec boee boeo boer boob booc booe boor bor- bora bore boro borr brab brac brae brao brca brcb brce brea breb brec bree breo brer broa brob broc broe broo bror brrr c-bo caaa caab caac caba cabe cabo cac- caca cacc cace caco cacr caec caer caor cara carb carc care caro carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cber cbre ccaa ccab ccac ccar ccba ccbc ccca cccb cccc ccee ccob ccoc ccra ccrc ccre ceac cear ceba cec- ceca cece ceco ceeb ceec ceor cer- cera cerc cere cero coba cobb cobe cobo coca coce coco coob cor- cora corb corc core coro corr crab crac crar crbc crca crcc crce crcr cre- crea creb crec cree creo crob croc croe croo cror eaba eaca eacc eaec eara earb eare earo ebac ebba ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ecaa ecac ecao ecar ecbc ecbe ecca eccb eccc ecce ecco eco- ecra ecrc ecrr eeca eeea eeee eeoc eera eerc eero eora eore erba erbb erbe erca ercc erce ereb erec erer erob eroc eroe eroo erra errc erre erro o-eo oaer oara oare obba obbo obea obec ober oboe obor obra obre obro ocab ocac ocbc occa occc oce ocee ocra ocre ocro ocrr oec- oeca oecc oeec oera oere ooaa ooba oobe oocr ooer oooo oora oore orab orac orae orao orar orba orbb orbe orbo orca orce orco ore- orea oreb orec oreo orer oro- oroe oror orra orro raab raba rabb rabe rabo rac- raca racc race raco raec raer raob raoc rara rarb rare raro rbbb rbbr rcac rcbc rcbo rccb rccc rea- reac reae reao rear reba rebb rebe rebo reca recc rece recr reeb rera rere rero roab roar rob- roba robb robe robo roca rocc roce roco roea roer roob roor rora rorc rore roro rrrr