-er a-a a-b a-c aaa aab aac aad aae aao aar aau ab- aba abb abc abd abe abo abr abu ac- aca acb acc acd ace aco acr acu ad- ada adb adc add ade ado adr adu aea aeb aec aed aee aeo aer aeu aoa aob aoc aod aoe aoo aor aou ar- ara arb arc ard are aro arr aru au- aua aub auc aud aue auo aur b-u baa bab bac bad bae bao bar bau bba bbb bbc bbd bbe bbo bbr bbu bca bcb bcc bcd bce bco bcr bcu bda bdb bdc bdd bde bdo bdr bdu be- bea beb bec bed bee beo ber beu boa bob boc bod boe boo bor bou bra brb brd bre bro brr bru bua bub buc bud bue buo bur buu c-- caa cab cac cad cae cao car cau cba cbb cbc cbd cbe cbo cbr cbu cca ccb ccc ccd cce cco ccr ccu cda cdb cdc cdd cde cdo cdr cdu ce- cea ceb cec ced cee ceo cer ceu co- coa cob coc cod coe coo cor cou cra crb crc crd cre cro crr cru cua cub cuc cud cue cuo cur cuu daa dab dac dad dae dao dar dau dba dbb dbc dbd dbe dbo dbr dbu dca dcb dcc dcd dce dco dcr dcu dda ddb ddc ddd dde ddo ddr ddu de- dea deb dec ded dee deo der deu doa dob doc dod doe doo dor dou dra drb drc drd dre dro drr dru dua dub duc dud due duo dur eaa eab eac ead eae eao ear eau eba ebb ebc ebd ebe ebo ebr ebu ec- eca ecb ecc ecd ece eco ecr ecu ed- eda edb edc edd ede edo edr edu eea eeb eec eed eee eeo eer eo- eoa eob eoc eod eoe eoo eor eou era erb erc erd ere ero err eru eu- eua eub euc eud eue eur oaa oab oac oad oae oao oar oau ob- oba obb obc obd obe obo obr obu oc- oca ocb occ ocd oco ocr ocu oda odb odc odd ode odo odr odu oea oeb oec oed oee oeo oer oo- ooa oob ooc ood ooo oor or- ora orb orc ord ore oro orr oru ou- oua ouc oud oue ouo our ra- raa rab rac rad rae rao rar rau rba rbb rbc rbd rbe rbo rbr rbu rca rcb rcc rcd rce rco rcr rcu rda rdb rdc rdd rde rdo rdr rdu re- rea reb rec red ree reo rer reu roa rob roc rod roe roo ror rou rra rrb rrc rrd rrr rru rua rub ruc rud rue ruo rur ruu ua- uaa uab uac uad uae uao uar uau uba ubb ubc ube ubo ubr ubu uca ucb ucc ucd uce uco ucr ucu uda udb udc udd ude udo udr udu uea ueb uec ued uee uer uoa uob uoc uod uoe uoo uor ur- ura urb urc urd ure uro urr uru uua uuc uue uur uuu

a-be a-do aaaa aaab aaac aaad aaae aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aaco aacr aacu aada aadc aade aadu aaea aaec aaoe aaoo aara aarc aard aare aaro aaru abaa abab abac abad abae abar abau abb- abba abbb abbe abbo abbr abca abcb abcc abcd abcr abda abdo abdu abec abed abee aber aboa abob abod aboo abor abou abra abrc abro abua abud abue acaa acab acac acad acae acar acba acca accc accd acce acco accu acda acdb acdc acde ace- acea acec aced acer acoa acod acoe acor acou acr- acra acrc acre acro acrr acu- acue acuo acur adaa adab adac adad adae adao adar adba adbc adcc adda addc addd adde addo addr addu adea adeb adee adeo ader adob adoc adod adoe adoo ador adra adre adro adua adub adue adur aeac aecb aede aeer aer- aera aerc aerd aero aoba aoca aoce aoeu aora aorb arab arac arad arae arar arau arba arbe arc- arca arce arco arda ardc arde ardo ardu area arec ared aree areo areu aroa arob arod aroe aroo aror arr- arra arrc arre arro arrr arru arua arub arud arue auaa aube auca auce audc aude audo auer aur- aura aurd aure auro baaa baad baar baba babb babe babo babr babu bac- baca bacc bace baco bada badb badd bade bado badr badu baed baer bar- bara barb barc bard bare baro barr baru bau- baud baur bbad bbau bbbb bbdd bbdo bbeb bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcor bcra bcru bcuc bd-r bdbc bddc bead bear beau beba bebb bebe bebo beca becu beda bede bedo bedu beeb beed beer beo- beod beor bera berc berd bere bero berr beru beur boab boac boad boar boba bobb bobe bobo bobu boca boce boco bocu boda bodb bode bodo bodu boea boec boee boeo boer boob booc bood booe boor bor- bora bord bore boro borr boru boua boud boue bour brab brac brad brae brao brau brca brcb brce brda brdo brea breb brec bred bree breo brer broa brob broc brod broe broo bror brou brrr bruc brud brue buad buar buba bubb bube bubo bubu buca bucc buce buco bucu buda budb budd bude budo budu buea buer bueu bur- bura burb burd bure buro burr buru c-bo c-cd caaa caab caac caba cabe cabo cabu cac- caca cacc cace caco cacr cada cadc cadd cade cado cadr cadu caec caer caeu caod caor cara carb carc card care caro carr cauc cauo cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbdb cbdc cbdo cbea cbec cbee cber cbrd cbre ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc cccu ccdc ccdr cced ccee ccob ccoc ccod ccra ccrc ccre ccuc cd-e cd-r cdaa cdac cdad cdba cdda cddb cddr cdec cder cdre