-er a-a a-b a-c a-t aaa aab aac aad aae aao aar aat ab- aba abb abc abd abe abo abr abt ac- aca acb acc acd ace aco acr act ad- ada adb adc add ade ado adr adt aea aeb aec aed aee aeo aer aet aoa aob aoc aod aoe aoo aor aot ar- ara arb arc ard are aro arr art at- ata atb atc atd ate ato atr att baa bab bac bad bae bao bar bat bba bbb bbc bbd bbe bbo bbr bbt bca bcb bcc bcd bce bco bcr bct bda bdb bdc bdd bde bdo bdr bdt be- bea beb bec bed bee beo ber bet boa bob boc bod boe boo bor bot bra brb brd bre bro brr brt bta btb btc btd bte bto btr btt c-- caa cab cac cad cae cao car cat cba cbb cbc cbd cbe cbo cbr cbt cca ccb ccc ccd cce cco ccr cct cda cdb cdc cdd cde cdo cdr cdt ce- cea ceb cec ced cee ceo cer cet co- coa cob coc cod coe coo cor cot cra crb crc crd cre cro crr crt cta ctb ctc ctd cte cto ctr ctt daa dab dac dad dae dao dar dat dba dbb dbc dbd dbe dbo dbr dbt dca dcb dcc dcd dce dco dcr dct dda ddb ddc ddd dde ddo ddr ddt de- dea deb dec ded dee deo der det doa dob doc dod doe doo dor dot dra drb drc drd dre dro drr drt dta dtb dtc dtd dte dto dtr dtt eaa eab eac ead eae eao ear eat eba ebb ebc ebd ebe ebo ebr ebt ec- eca ecb ecc ecd ece eco ecr ect ed- eda edb edc edd ede edo edr edt eea eeb eec eed eee eeo eer eet eo- eoa eob eoc eod eoe eoo eor eot era erb erc erd ere ero err ert eta etb etc etd ete eto etr ett oaa oab oac oad oae oao oar oat ob- oba obb obc obd obe obo obr obt oc- oca ocb occ ocd oco ocr oct oda odb odc odd ode odo odr odt oea oeb oec oed oee oeo oer oet oo- ooa oob ooc ood ooo oor oot or- ora orb orc ord ore oro orr ort ot- ota otb otc otd ote oto otr ott ra- raa rab rac rad rae rao rar rat rba rbb rbc rbd rbe rbo rbr rbt rca rcb rcc rcd rce rco rcr rct rda rdb rdc rdd rde rdo rdr rdt re- rea reb rec red ree reo rer ret roa rob roc rod roe roo ror rot rra rrb rrc rrd rrr rrt rta rtb rtc rtd rte rto rtr rtt taa tab tac tad tae tao tar tat tba tbb tbc tbd tbe tbo tbr tbt tca tcb tcc tcd tce tco tcr tct tda tdb tdc tdd tde tdo tdr tdt te- tea teb tec ted tee teo ter tet to- toa tob toc tod toe too tor tot tra trb trc trd tre tro trr trt tta ttb ttc ttd tte tto ttr ttt

a-be a-do aaaa aaab aaac aaad aaae aaar aaba aabb aabc aabd aabt aaca aacb aacc aacd aace aaco aacr aact aada aadc aade aadt aaea aaec aaoe aaoo aara aarc aard aare aaro aart aata aatc aatt abaa abab abac abad abae abar abat abb- abba abbb abbe abbo abbr abbt abca abcb abcc abcd abcr abct abda abdo abec abed abee aber abet aboa abob abod aboo abor abot abra abrc abro abta ac-t acaa acab acac acad acae acar acat acba acca accc accd acce acco acct acda acdb acdc acde acdt ace- acea acec aced acer acet acoa acod acoe acor acot acr- acra acrc acre acro acrr acta actc acte acto actt adaa adab adac adad adae adao adar adat adba adbc adcc adda addc addd adde addo addr adea adeb adee adeo ader adet adob adoc adod adoe adoo ador adot adra adre adro adta aeac aecb aect aede aedt aeer aer- aera aerc aerd aero aeta aetc aeto aetr aett aoba aoca aoce aora aorb aort aotc aotd arab arac arad arae arar arat arba arbe arc- arca arce arco arct arda ardc arde ardo area arec ared aree areo aret aroa arob arod aroe aroo aror arr- arra arrc arre arro arrr arrt arta artc arte arto artr at-t ataa atab atac atad atae atar atat atca atcc atco atcr atdt atea atec ated atee ateo ater atob atoc atod atoe ator atot atra atrc atre atro atta atte atto attr baaa baad baar baat baba babb babe babo babr bac- baca bacc bace baco bact bada badb badd bade bado badr baed baer bar- bara barb barc bard bare baro barr bart bata batc bate bato batt bbad bbbb bbdd bbdo bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcda bcde bcec bcer bcet bcor bcra bctc bd-r bdbc bddc bead bear beat beba bebb bebe bebo beca beda bede bedo beeb beed beer beet beo- beod beor beot bera berc berd bere bero berr bert beta betc bete beto bett boab boac boad boar boat boba bobb bobe bobo boca boce boco boda bodb bode bodo boea boec boee boeo boer boet boob booc bood booe boor boot bor- bora bord bore boro borr bort bota botb botd bote boto bott brab brac brad brae brao brat brca brcb brce brda brdo brdt brea breb brec bred bree breo brer bret broa brob broc brod broe broo bror brot brrr brtc btaa btcc btdt btec btob btor btrc btrt bttb c-bo c-cd caaa caab caac caat 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 cart cat- cata catb catc catd cate cato catt cbac cbar cbat cbbc