-er a-a a-b a-c aaa aab aac aad aae aao aar ab- aba abb abc abd abe abo abr ac- aca acb acc acd ace aco acr ad- ada adb adc add ade ado adr aea aeb aec aed aee aeo aer aoa aob aoc aod aoe aoo aor ar- ara arb arc ard are aro arr baa bab bac bad bae bao bar bba bbb bbc bbd bbe bbo bbr bca bcb bcc bcd bce bco bcr bda bdb bdc bdd bde bdo bdr be- bea beb bec bed bee beo ber boa bob boc bod boe boo bor bra brb brd bre bro brr c-- caa cab cac cad cae cao car cba cbb cbc cbd cbe cbo cbr cca ccb ccc ccd cce cco ccr cda cdb cdc cdd cde cdo cdr ce- cea ceb cec ced cee ceo cer co- coa cob coc cod coe coo cor cra crb crc crd cre cro crr daa dab dac dad dae dao dar dba dbb dbc dbd dbe dbo dbr dca dcb dcc dcd dce dco dcr dda ddb ddc ddd dde ddo ddr de- dea deb dec ded dee deo der doa dob doc dod doe doo dor dra drb drc drd dre dro drr eaa eab eac ead eae eao ear eba ebb ebc ebd ebe ebo ebr ec- eca ecb ecc ecd ece eco ecr ed- eda edb edc edd ede edo edr eea eeb eec eed eee eeo eer eo- eoa eob eoc eod eoe eoo eor era erb erc erd ere ero err oaa oab oac oad oae oao oar ob- oba obb obc obd obe obo obr oc- oca ocb occ ocd oco ocr oda odb odc odd ode odo odr oea oeb oec oed oee oeo oer oo- ooa oob ooc ood ooo oor or- ora orb orc ord ore oro orr ra- raa rab rac rad rae rao rar rba rbb rbc rbd rbe rbo rbr rca rcb rcc rcd rce rco rcr rda rdb rdc rdd rde rdo rdr re- rea reb rec red ree reo rer roa rob roc rod roe roo ror rra rrb rrc rrd rrr

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