-er a-a a-b a-c a-t aaa aab aac aae aao aar aat ab- aba abb abc abe abo abr abt ac- aca acb acc ace aco acr act aea aeb aec aee aeo aer aet aoa aob aoc aoe aoo aor aot ar- ara arb arc are aro arr art at- ata atb atc ate ato atr att baa bab bac bae bao bar bat bba bbb bbc bbe bbo bbr bbt bca bcb bcc bce bco bcr bct be- bea beb bec bee beo ber bet boa bob boc boe boo bor bot bra brb bre bro brr brt bta btb btc bte bto btr btt c-- caa cab cac cae cao car cat cba cbb cbc cbe cbo cbr cbt cca ccb ccc cce cco ccr cct ce- cea ceb cec cee ceo cer cet co- coa cob coc coe coo cor cot cra crb crc cre cro crr crt cta ctb ctc cte cto ctr ctt eaa eab eac eae eao ear eat eba ebb ebc ebe ebo ebr ebt ec- eca ecb ecc ece eco ecr ect eea eeb eec eee eeo eer eet eo- eoa eob eoc eoe eoo eor eot era erb erc ere ero err ert eta etb etc ete eto etr ett oaa oab oac oae oao oar oat ob- oba obb obc obe obo obr obt oc- oca ocb occ oco ocr oct oea oeb oec oee oeo oer oet oo- ooa oob ooc ooo oor oot or- ora orb orc ore oro orr ort ot- ota otb otc ote oto otr ott ra- raa rab rac rae rao rar rat rba rbb rbc rbe rbo rbr rbt rca rcb rcc rce rco rcr rct re- rea reb rec ree reo rer ret roa rob roc roe roo ror rot rra rrb rrc rrr rrt rta rtb rtc rte rto rtr rtt taa tab tac tae tao tar tat tba tbb tbc tbe tbo tbr tbt tca tcb tcc tce tco tcr tct te- tea teb tec tee teo ter tet to- toa tob toc toe too tor tot tra trb trc tre tro trr trt tta ttb ttc tte tto ttr ttt

a-be aaaa aaab aaac aaae aaar aaba aabb aabc aabt aaca aacb aacc aace aaco aacr aact aaea aaec aaoe aaoo aara aarc aare aaro aart aata aatc aatt abaa abab abac abae abar abat abb- abba abbb abbe abbo abbr abbt abca abcb abcc abcr abct abec abee aber abet aboa abob aboo abor abot abra abrc abro abta ac-t acaa acab acac acae acar acat acba acca accc acce acco acct ace- acea acec acer acet acoa acoe acor acot acr- acra acrc acre acro acrr acta actc acte acto actt aeac aecb aect aeer aer- aera aerc aero aeta aetc aeto aetr aett aoba aoca aoce aora aorb aort aotc arab arac arae arar arat arba arbe arc- arca arce arco arct area arec aree areo aret aroa arob aroe aroo aror arr- arra arrc arre arro arrr arrt arta artc arte arto artr at-t ataa atab atac atae atar atat atca atcc atco atcr atea atec atee ateo ater atob atoc atoe ator atot atra atrc atre atro atta atte atto attr baaa baar baat baba babb babe babo babr bac- baca bacc bace baco bact baer bar- bara barb barc bare baro barr bart bata batc bate bato batt bbbb bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcor bcra bctc bear beat beba bebb bebe bebo beca beeb beer beet beo- beor beot bera berc bere bero berr bert beta betc bete beto bett boab boac boar boat boba bobb bobe bobo boca boce boco boea boec boee boeo boer boet boob booc booe boor boot bor- bora bore boro borr bort bota botb bote boto bott brab brac brae brao brat brca brcb brce brea breb brec bree breo brer bret broa brob broc broe broo bror brot brrr brtc btaa btcc btec btob btor btrc btrt bttb c-bo caaa caab caac caat caba cabe cabo cac- caca cacc cace caco cacr caec caer caor cara carb carc care caro carr cart cat- cata catb catc cate cato catt cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbea cbec cbee cber cbet cbot cbre cbrt cbta cbtc ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc ccee ccob ccoc ccra ccrc ccre ccrt cctb cctc cctt ceac cear ceat ceba cec- ceca cece ceco cect ceeb ceec ceor cer- cera cerc cere cero cert cet- ceta cete ceto coat coba cobb cobe cobo coca coce coco coct coob coot cor- cora corb corc core coro corr cort cota cotb cotc cote coto cott crab crac crar crat crbc crca crcc crce crcr cre- crea creb crec cree creo cret crob croc croe croo cror crot crrt crtc ctab ctae ctba ctca ctec ctor ctot ctrc ctta eaba eaca eacc eaec eara earb eare earo eart eata eate ebac ebba ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ecaa ecac ecao ecar ecat ecbc ecbe ecca eccb eccc ecce ecco ecct eco- ecot ecra ecrc ecrr ect- ecta ectc ecto eeca eeea eeee eeoc eera eerc eero eeta eetc eete eora eore eota eotc eoto erat erba erbb erbe erca ercc erce ereb erec erer eret erob eroc eroe eroo erra errc erre erro erta etat etbc etbr etcc etco etec etee eter etoe etra etre etro etta ette etto o-eo oaer oara oare oate obba obbo obea obec ober obet oboe obor obot obra obre obro ocab ocac ocat ocbc occa occc occt oce ocee ocet ocra ocre ocro ocrr oct- octa octe octo oec- oeca oecc oeec oera oere oeta ooaa ooba oobe oocr ooer oooo oora oore oort ootb orab orac orae orao orar orat orba orbb orbe orbo orca orce orco ore- orea oreb orec oreo orer oro- oroe oror orot orra orro orta ortc orte orto otac otar otea otee