-er a-a a-b a-c aaa aab aac aae aao aar aau ab- aba abb abc abe abo abr abu ac- aca acb acc ace aco acr acu aea aeb aec aee aeo aer aeu aoa aob aoc aoe aoo aor aou ar- ara arb arc are aro arr aru au- aua aub auc aue auo aur b-u baa bab bac bae bao bar bau bba bbb bbc bbe bbo bbr bbu bca bcb bcc bce bco bcr bcu be- bea beb bec bee beo ber beu boa bob boc boe boo bor bou bra brb bre bro brr bru bua bub buc bue buo bur buu c-- caa cab cac cae cao car cau cba cbb cbc cbe cbo cbr cbu cca ccb ccc cce cco ccr ccu ce- cea ceb cec cee ceo cer ceu co- coa cob coc coe coo cor cou cra crb crc cre cro crr cru cua cub cuc cue cuo cur cuu eaa eab eac eae eao ear eau eba ebb ebc ebe ebo ebr ebu ec- eca ecb ecc ece eco ecr ecu eea eeb eec eee eeo eer eo- eoa eob eoc eoe eoo eor eou era erb erc ere ero err eru eu- eua eub euc eue eur oaa oab oac oae oao oar oau ob- oba obb obc obe obo obr obu oc- oca ocb occ oco ocr ocu oea oeb oec oee oeo oer oo- ooa oob ooc ooo oor or- ora orb orc ore oro orr oru ou- oua ouc oue ouo our ra- raa rab rac rae rao rar rau rba rbb rbc rbe rbo rbr rbu rca rcb rcc rce rco rcr rcu re- rea reb rec ree reo rer reu roa rob roc roe roo ror rou rra rrb rrc rrr rru rua rub ruc rue ruo rur ruu ua- uaa uab uac uae uao uar uau uba ubb ubc ube ubo ubr ubu uca ucb ucc uce uco ucr ucu uea ueb uec uee uer uoa uob uoc uoe uoo uor ur- ura urb urc ure uro urr uru uua uuc uue uur uuu

a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aaco aacr aacu aaea aaec aaoe aaoo aara aarc aare aaro aaru abaa abab abac abae abar abau abb- abba abbb abbe abbo abbr abca abcb abcc abcr abec abee aber aboa abob aboo abor abou abra abrc abro abua abue acaa acab acac acae acar acba acca accc acce acco accu ace- acea acec acer acoa acoe acor acou acr- acra acrc acre acro acrr acu- acue acuo acur aeac aecb aeer aer- aera aerc aero aoba aoca aoce aoeu aora aorb arab arac arae arar arau arba arbe arc- arca arce arco area arec aree areo areu aroa arob aroe aroo aror arr- arra arrc arre arro arrr arru arua arub arue auaa aube auca auce auer aur- aura aure auro baaa baar baba babb babe babo babr babu bac- baca bacc bace baco baer bar- bara barb barc bare baro barr baru bau- baur bbau bbbb bbeb bbrc bcaa bcar bcbc bcca bccc bcec bcer bcor bcra bcru bcuc bear beau beba bebb bebe bebo beca becu beeb beer beo- beor bera berc bere bero berr beru beur boab boac boar boba bobb bobe bobo bobu boca boce boco bocu boea boec boee boeo boer boob booc booe boor bor- bora bore boro borr boru boua boue bour brab brac brae brao brau brca brcb brce brea breb brec bree breo brer broa brob broc broe broo bror brou brrr bruc brue buar buba bubb bube bubo bubu buca bucc buce buco bucu buea buer bueu bur- bura burb bure buro burr buru c-bo caaa caab caac caba cabe cabo cabu cac- caca cacc cace caco cacr caec caer caeu caor cara carb carc care caro carr cauc cauo cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbea cbec cbee cber cbre ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccu ccee ccob ccoc ccra ccrc ccre ccuc ceac cear ceba cebu cec- ceca cece ceco ceeb ceec ceor ceou cer- cera cerc cere cero coba cobb cobe cobo cobu coca coce coco cocu coob cor- cora corb corc core coro corr coua coub coue cour crab crac crar crau crbc crbu crca crcc crce crcr cre- crea creb crec cree creo creu crob croc croe croo cror crub crue cuau cub- cuba cubb cube cuca cucc cuce cuer cura curb cure curo curr eaba eaca eacc eaec eara earb eare earo ebac ebba ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ebru ebur ecaa ecac ecao ecar ecbc ecbe ecca eccb eccc ecce ecco eco- ecou ecra ecrc ecrr ecru ecua eeca eeea eeee eeoc eera eerc eero eora eore erau erba erbb erbe erca ercc erce ereb erec erer erob eroc eroe eroo erra errc erre erro erua erub eruc erur euba eubc euer eur- eura eurc eure euro o-eo oaau oaer oara oare obba obbo obea obec ober oboe obor obra obre obro ocab ocac ocbc occa occc oce ocee ocra ocre ocro ocrr ocur oec- oeca oecc oeec oera oere ooaa ooba oobe oocr ooer oooo oora oore orab orac orae orao orar orba orbb orbe orbo orbu orca orce orco ore- orea oreb orec oreo orer oro- oroe oror orra orro orub ouac oucc ouea ouer our- oura oure ouro ouu- raab raba rabb rabe rabo rabu rac- raca racc race raco racu raec raer raob raoc rara rarb rare raro raua raub rauc raue rbbb rbbr rcac rcbc rcbo rccb rccc rea- reac reae reao rear reau reba rebb rebe rebo rebu reca recc rece recr recu reeb reou rera rere rero reru reue reuu roab roar rob- roba robb robe robo robu roca rocc roce roco roea roer roob roor rora rorc rore roro roru roua roub roue rrrr ruba rubb rube rubu ruca ruce ruer rura rurc rure ruro ruru uabc uaca uaoc uarc