-er a-a a-b a-c aaa aab aac aad aae aaf aao aar ab- aba abb abc abd abe abf abo abr ac- aca acb acc acd ace acf aco acr ad- ada adb adc add ade adf ado adr aea aeb aec aed aee aef aeo aer af- afa afb afc afd afe aff afo afr aoa aob aoc aod aoe aof aoo aor ar- ara arb arc ard are arf aro arr baa bab bac bad bae baf bao bar bba bbb bbc bbd bbe bbf bbo bbr bca bcb bcc bcd bce bcf bco bcr bda bdb bdc bdd bde bdf bdo bdr be- bea beb bec bed bee bef beo ber bfa bfb bfc bfd bfe bff bfo bfr boa bob boc bod boe bof boo bor bra brb brd bre brf bro brr c-- caa cab cac cad cae caf cao car cba cbb cbc cbd cbe cbf cbo cbr cca ccb ccc ccd cce ccf cco ccr cda cdb cdc cdd cde cdf cdo cdr ce- cea ceb cec ced cee cef ceo cer cfa cfb cfc cfd cfe cff cfo cfr co- coa cob coc cod coe cof coo cor cra crb crc crd cre crf cro crr daa dab dac dad dae daf dao dar dba dbb dbc dbd dbe dbf dbo dbr dca dcb dcc dcd dce dcf dco dcr dda ddb ddc ddd dde ddf ddo ddr de- dea deb dec ded dee def deo der dfa dfb dfc dfd dfe dff dfo dfr doa dob doc dod doe dof doo dor dra drb drc drd dre dro drr eaa eab eac ead eae eaf eao ear eba ebb ebc ebd ebe ebf ebo ebr ec- eca ecb ecc ecd ece ecf eco ecr ed- eda edb edc edd ede edf edo edr eea eeb eec eed eee eef eeo eer ef- efa efb efc efd efe eff efo efr eo- eoa eob eoc eod eoe eof eoo eor era erb erc erd ere erf ero err faa fab fac fad fae faf fao far fba fbb fbc fbd fbe fbf fbo fbr fca fcb fcc fcd fce fcf fco fcr fda fdb fdc fdd fde fdf fdo fdr fea feb fec fed fee fef feo fer ffa ffc ffd ffe fff ffo ffr foa fob foc foe fof foo for fra frb frc frd fre frf fro frr oaa oab oac oad oae oaf oao oar ob- oba obb obc obd obe obf obo obr oc- oca ocb occ ocd ocf oco ocr oda odb odc odd ode odf odo odr oea oeb oec oed oee oef oeo oer of- ofa ofb ofc ofd ofe off ofo ofr oo- ooa oob ooc ood oof ooo oor or- ora orb orc ord ore orf oro orr ra- raa rab rac rad rae raf rao rar rba rbb rbc rbd rbe rbf rbo rbr rca rcb rcc rcd rce rcf rco rcr rda rdb rdc rdd rde rdf rdo rdr re- rea reb rec red ree ref reo rer rfa rfb rfc rfd rfe rff rfo rfr roa rob roc rod roe rof roo ror rra rrb rrc rrd rrf rrr

a-be a-do aaaa aaab aaac aaad aaae aaaf aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aacf aaco aacr aada aadc aade aaea aaec aafa aafb aafc aafd aaff aaoe aaoo aara aarc aard aare aaro abaa abab abac abad abae abaf abar abb- abba abbb abbe abbo abbr abca abcb abcc abcd abcf abcr abda abdo abec abed abee aber abff aboa abob abod abof aboo abor abra abrc abro acaa acab acac acad acae acar acba acca accc accd acce accf acco acda acdb acdc acde acdf ace- acea acec aced acer acfc acfd acfe 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 adfa adfc adob adoc adod adoe adoo ador adra adre adro aeac aeaf aecb aede aeer aer- aera aerc aerd aero afaa afad afao afar afca afcb afcc afdb afdc afee afer affa affc affo afoa afoe afoo afor afr- afra afrc afre afro aoba aoca aoce aora aorb arab arac arad arae araf arar arba arbe arc- arca arce arco arda ardc arde ardf ardo area arec ared aree aref areo arfa arfb arfc arff aroa arob arod aroe aroo aror arr- arra arrc arre arro arrr baaa baad baaf baar baba babb babe babo babr bac- baca bacc bace baco bada badb badd bade bado badr baed baer bafc baff bafo bar- bara barb barc bard bare barf baro barr bbad bbbb bbdd bbdo bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcfc bcof bcor bcra bd-r bdbc bddc bead beaf bear beba bebb bebe bebo beca beda bede bedo beeb beed beef beer befa befe beff befo beo- beod beof beor bera berc berd bere bero berr bfca boab boac boad boar boba bobb bobe bobo boca boce boco boda bodb bode bodo boea boec boee boef boeo boer bofa bofd bofe boff boob booc bood booe boof boor bor- bora bord bore borf boro borr brab brac brad brae braf brao brca brcb brce brda brdo brea breb brec bred bree bref breo brer brfc broa brob broc brod broe broo bror brrr c-bo c-cd caaa caab caac caaf caba cabe cabf cabo cac- caca cacc cace caco cacr cada cadc cadd cade cado cadr caec caer cafa cafb cafc cafe caff caod caor cara carb carc card care carf caro carr cbac cbar cbbc cbca cbcc cbce cbcr cbdb cbdc cbdo cbea cbec cbee cbef cber cbfb cbfc cbrd cbre ccaa ccab ccac ccad ccaf ccar ccba ccbc ccca cccb cccc cccf ccdc ccdf ccdr cced ccee ccfa ccfc ccfd ccff ccob ccoc ccod ccra ccrc ccre ccrf cd-e cd-r cdaa cdac cdad cdba cdbf cdda cddb cddr cdec cdef cder cdfa