-er a-a a-b a-c aaa aab aac aae aag aao aar aau ab- aba abb abc abe abg abo abr abu ac- aca acb acc ace acg aco acr acu aea aeb aec aee aeg aeo aer aeu ag- aga agb agc age agg ago agr agu aoa aob aoc aoe aog aoo aor aou ar- ara arb arc are arg aro arr aru au- aua aub auc aue aug auo aur b-u baa bab bac bae bag bao bar bau bba bbb bbc bbe bbg bbo bbr bbu bca bcb bcc bce bcg bco bcr bcu be- bea beb bec bee beg beo ber beu bga bgb bgc bge bgg bgo bgr bgu boa bob boc boe bog boo bor bou bra brb bre brg bro brr bru bua bub buc bue bug buo bur buu c-- caa cab cac cae cag cao car cau cba cbb cbc cbe cbg cbo cbr cbu cca ccb ccc cce ccg cco ccr ccu ce- cea ceb cec cee ceg ceo cer ceu cga cgb cgc cge cgg cgo cgr cgu co- coa cob coc coe cog coo cor cou cra crb crc cre crg cro crr cru cua cub cuc cue cug cuo cur cuu eaa eab eac eae eag eao ear eau eba ebb ebc ebe ebg ebo ebr ebu ec- eca ecb ecc ece ecg eco ecr ecu eea eeb eec eee eeg eeo eer ega egb egc ege egg ego egr egu eo- eoa eob eoc eoe eog eoo eor eou era erb erc ere erg ero err eru eu- eua eub euc eue eug eur gaa gab gac gae gag gao gar gau gba gbc gbe gbg gbo gbr gbu gca gcb gcc gce gcg gco gcr gcu ge- gea geb gec gee geg geo ger geu gga ggb ggc ggg ggo ggr ggu goa gob goc goe gog goo gor gou gra grb grc gre grg gro grr gru gu- gua gub guc gue gug guo gur guu oaa oab oac oae oag oao oar oau ob- oba obb obc obe obg obo obr obu oc- oca ocb occ ocg oco ocr ocu oea oeb oec oee oeg oeo oer oga ogc oge ogg ogo oo- ooa oob ooc oog ooo oor or- ora orb orc ore org oro orr oru ou- oua ouc oue ouo our ra- raa rab rac rae rag rao rar rau rba rbb rbc rbe rbg rbo rbr rbu rca rcb rcc rce rcg rco rcr rcu re- rea reb rec ree reg reo rer reu rga rgb rgc rge rgg rgo rgr roa rob roc roe rog roo ror rou rra rrb rrc rrg rrr rru rua rub ruc rue rug ruo rur ruu ua- uaa uab uac uae uag uao uar uau uba ubb ubc ube ubg ubo ubr ubu uca ucb ucc uce ucg uco ucr ucu uea ueb uec uee ueg uer uga ugb ugc uge ugg ugo ugr ugu uoa uob uoc uoe uog uoo uor ur- ura urb urc ure urg uro urr uru uua uuc uue uug uur uuu

a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aaco aacr aacu aaea aaec aage aaoe aaoo aara aarc aare aaro aaru abaa abab abac abae abag abar abau abb- abba abbb abbe abbo abbr abca abcb abcc abcr abec abee aber aboa abob aboo abor abou abra abrc abro abua abue abug acaa acab acac acae acag acar acba acca accc acce acco accu ace- acea acec acer acga acgr acoa acoe acog acor acou acr- acra acrc acre acro acrr acu- acue acuo acur aeac aecb aeer aega aer- aera aerc aero ag-o agac agag agao agar agau agba agbo agca agcc agce agco agea agee ager agga agge aggu agob agog agoo agou agra agre agro agua ague agur aoba aoca aoce aoeu aora aorb arab arac arae arag arar arau arba arbe arc- arca arce arco area arec aree areg areo areu arga argb arge argo aroa arob aroe aroo aror arr- arra arrc arre arrg arro arrr arru arua arub arue arug auaa aube auca auce auer auga auge aur- aura aure auro auug baaa baar baba babb babe babo babr babu bac- baca bacc bace baco baer baga bage bagg bago bar- bara barb barc bare barg baro barr baru bau- baug baur bbau bbbb bbeb bbga bbrc bbrg bcaa bcar bcbc bcbg bcca bccc bcec bcer bcor bcra bcru bcuc beag bear beau beba bebb bebe bebo beca becu beeb beeg beer bega begg bego begu beo- beor bera berc bere berg bero berr beru beur bgca boab boac boag boar boba bobb bobe bobo bobu boca boce boco bocu boea boec boee boeo boer boga boge bogg bogo boob booc booe boog boor bor- bora bore borg boro borr boru boua boue bour brab brac brae brag brao brau brca brcb brce brea breb brec bree breg breo brer broa brob broc broe brog broo bror brou brrr bruc brue brug buar buba bubb bube bubo bubu buca bucc buce buco bucu buea buer bueu buga buge bugg bugo bur- bura burb bure burg buro burr buru c-bo caaa caab caac caba cabe cabg cabo cabu cac- caca cacc cace caco cacr caec caer caeu caga cage cagg cago cagr caor cara carb carc care caro carr cauc cauo cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbea cbec cbee cber cbga cbgb cbre ccaa ccab ccac ccag ccar ccba ccbc ccca cccb cccc cccu ccee ccga ccgc ccob ccoc ccra ccrc ccre ccrg ccuc ceac cear ceba cebu cec- ceca cece ceco ceeb ceec cege cego ceor ceou cer- cera cerc cere cero cgac cgcc cgcg cger cgro coag coba cobb cobe cobo cobu coca coce coco cocu cogo coob cor- cora corb corc core corg coro corr coua coub coue cour crab crac crag crar crau crbc crbu crca crcc crce crcr cre- crea creb crec cree creg creo creu crob