-er a-a a-b a-c aaa aab aac aad aae aak aao aar ab- aba abb abc abd abe abk abo abr ac- aca acb acc acd ace ack aco acr ad- ada adb adc add ade adk ado adr aea aeb aec aed aee aek aeo aer aka akb akc akd ake akk ako akr aoa aob aoc aod aoe aok aoo aor ar- ara arb arc ard are ark aro arr baa bab bac bad bae bak bao bar bba bbb bbc bbd bbe bbk bbo bbr bca bcb bcc bcd bce bck bco bcr bda bdb bdc bdd bde bdk bdo bdr be- bea beb bec bed bee bek beo ber bka bkb bkc bke bkk bko bkr boa bob boc bod boe bok boo bor bra brb brd bre brk bro brr c-- caa cab cac cad cae cak cao car cba cbb cbc cbd cbe cbk cbo cbr cca ccb ccc ccd cce cck cco ccr cda cdb cdc cdd cde cdk cdo cdr ce- cea ceb cec ced cee cek ceo cer cka ckb ckc ckd cko co- coa cob coc cod coe cok coo cor cra crb crc crd cre crk cro crr daa dab dac dad dae dak dao dar dba dbb dbc dbd dbe dbk dbo dbr dca dcb dcc dcd dce dck dco dcr dda ddb ddc ddd dde ddk ddo ddr de- dea deb dec ded dee dek deo der dka dkb dkc dke dkk dko dkr doa dob doc dod doe dok doo dor dra drb drc drd dre drk dro drr eaa eab eac ead eae eak eao ear eba ebb ebc ebd ebe ebk ebo ebr ec- eca ecb ecc ecd ece eck eco ecr ed- eda edb edc edd ede edk edo edr eea eeb eec eed eee eek eeo eer eka ekb ekc ekd eke eko ekr eo- eoa eob eoc eod eoe eok eoo eor era erb erc erd ere erk ero err ka- kaa kab kac kad kae kak kao kar kba kbb kbc kbd kbe kbk kbo kbr kca kcb kcc kcd kce kck kcr kda kdb kdc kde kdk kdo kdr ke- kea keb kec ked kee kek keo ker kkb kkc kke kkk kkr koa kob koc kod koe kok koo kor kra krc krd krk kro krr oaa oab oac oad oae oak oao oar ob- oba obb obc obd obe obk obo obr oc- oca ocb occ ocd ock oco ocr oda odb odc odd ode odo odr oea oeb oec oed oee oeo oer oka okb okc okd oke okk oko okr oo- ooa oob ooc ood ook ooo oor or- ora orb orc ord ore ork oro orr ra- raa rab rac rad rae rak rao rar rba rbb rbc rbd rbe rbk rbo rbr rca rcb rcc rcd rce rco rcr rda rdb rdc rdd rde rdo rdr re- rea reb rec red ree rek reo rer rkb rkc rke rkk rko roa rob roc rod roe rok roo ror rra rrb rrc rrd rrk rrr

a-ak a-be a-do a-ok aaaa aaab aaac aaad aaae aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aack aaco aacr aada aadc aade aaea aaec aaka aake aaoe aaoo aara aarc aard aare aaro abaa abab abac abad abae abak abar abb- abba abbb abbe abbo abbr abca abcb abcc abcd abcr abda abdo abec abed abee aber aboa abob abod abok 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 acek acer ackd acke acoa acod acoe acor acr- acra acrc acre acro acrr adaa adab adac adad adae adak adao adar adba adbc adcc adda addc addd adde addo addr adea adeb adee adeo ader adob adoc adod adoe adok adoo ador adra adre adro aeac aecb aede aeer aeka aer- aera aerc aerd aero akaa akae akao akar akca aked akee aker akka akko akok akr- akra akre aoba aoca aoce aora aorb arab arac arad arae arak arar arba arbe arc- arca arce arco arda ardc arde ardo area arec ared aree arek areo arka arke arko aroa arob arod aroe aroo aror arr- arra arrc arre arrk arro arrr baaa baad baak baar baba babb babe babo babr bac- baca bacc bace back baco bada badb badd bade bado badr baed baek baer bak- baka bake bako bakr bar- bara barb barc bard bare bark baro barr bbad bbbb bbdd bbdo bbeb bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcor bcra bd-r bdbc bddc bead beak bear beba bebb bebe bebo beca beck beda bede bedo beeb beed beek beer beka beke beko beo- beod beok beor bera berc berd bere berk bero berr boab boac boad boak boar boba bobb bobe bobo boca boce bock boco boda bodb bode bodo boea boec boee boeo boer boka boke boko boob booc bood booe book boor bor- bora bord bore bork boro borr brab brac brad brae brak brao brca brcb brce brda brdo brea breb brec bred bree brek breo brer brka brkb broa brob broc brod broe brok broo bror brrr c-bo c-cd caaa caab caac caba cabe cabo cac- caca cacc cace cack caco cacr cada cadc cadd cade cado cadr caec caer caka cake caod caor cara carb carc card care cark caro carr cbac cbar cbbc cbca cbcc cbce cbcr cbdb cbdc cbdo cbea cbec cbee cber cbka cbko cbkr 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 ceke ceor cer- cera cerc cerd cere cero ckac ckbc ckbe ckck ckco ckdo cker ckoa ckob ckoc ckoo ckor ckrc ckrd coad coak coba cobb cobe cobo coca coce cock