-er a-a a-b a-c aaa aab aac aad aae aag aar aau ab- aba abb abc abd abe abg abr abu ac- aca acb acc acd ace acg acr acu ad- ada adb adc add ade adg adr adu aea aeb aec aed aee aeg aer aeu ag- aga agb agc agd age agg agr agu ar- ara arb arc ard are arg arr aru au- aua aub auc aud aue aug aur b-u baa bab bac bad bae bag bar bau bba bbb bbc bbd bbe bbg bbr bbu bca bcb bcc bcd bce bcg bcr bcu bda bdb bdc bdd bde bdg bdr bdu be- bea beb bec bed bee beg ber beu bga bgb bgc bgd bge bgg bgr bgu bra brb brd bre brg brr bru bua bub buc bud bue bug bur buu c-- caa cab cac cad cae cag car cau cba cbb cbc cbd cbe cbg cbr cbu cca ccb ccc ccd cce ccg ccr ccu cda cdb cdc cdd cde cdg cdr cdu ce- cea ceb cec ced cee ceg cer ceu cga cgb cgc cgd cge cgg cgr cgu cra crb crc crd cre crg crr cru cua cub cuc cud cue cug cur cuu daa dab dac dad dae dag dar dau dba dbb dbc dbd dbe dbg dbr dbu dca dcb dcc dcd dce dcg dcr dcu dda ddb ddc ddd dde ddg ddr ddu de- dea deb dec ded dee deg der deu dga dgc dgd dge dgg dgr dgu dra drb drc drd dre drg drr dru dua dub duc dud due dug dur eaa eab eac ead eae eag ear eau eba ebb ebc ebd ebe ebg ebr ebu ec- eca ecb ecc ecd ece ecg ecr ecu ed- eda edb edc edd ede edg edr edu eea eeb eec eed eee eeg eer ega egb egc egd ege egg egr egu era erb erc erd ere erg err eru eu- eua eub euc eud eue eug eur g-d gaa gab gac gad gae gag gar gau gba gbc gbd gbe gbg gbr gbu gca gcb gcc gcd gce gcg gcr gcu gda gdb gdc gdd gde gdr gdu ge- gea geb gec ged gee geg ger geu gga ggb ggc ggd ggg ggr ggu gra grb grc grd gre grg grr gru gu- gua gub guc gud gue gug gur guu ra- raa rab rac rad rae rag rar rau rba rbb rbc rbd rbe rbg rbr rbu rca rcb rcc rcd rce rcg rcr rcu rda rdb rdc rdd rde rdg rdr rdu re- rea reb rec red ree reg rer reu rga rgb rgc rgd rge rgg rgr rra rrb rrc rrd rrg rrr rru rua rub ruc rud rue rug rur ruu ua- uaa uab uac uad uae uag uar uau uba ubb ubc ube ubg ubr ubu uca ucb ucc ucd uce ucg ucr ucu uda udb udc udd ude udg udr udu uea ueb uec ued uee ueg uer uga ugb ugc uge ugg ugr ugu ur- ura urb urc urd ure urg urr uru uua uuc uue uug uur uuu

a-be aaaa aaab aaac aaad aaae aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aacr aacu aada aadc aade aadu aaea aaec aage aara aarc aard aare aaru abaa abab abac abad abae abag abar abau abb- abba abbb abbe abbr abca abcb abcc abcd abcr abda abdu abec abed abee aber abgd abra abrc abua abud abue abug acaa acab acac acad acae acag acar acba acca accc accd acce accu acda acdb acdc acde ace- acea acec aced acer acga acgr acr- acra acrc acre acrr acu- acue acur adaa adab adac adad adae adag adar adba adbc adcc adda addc addd adde addr addu adea adeb adee ader adra adre adua adub adue adur aeac aecb aede aeer aega aer- aera aerc aerd agac agad agag agar agau agba agca agcc agce agda agde agea aged agee ager agga agge aggu agra agre agua ague agur arab arac arad arae arag arar arau arba arbe arc- arca arce arda ardc arde ardu area arec ared aree areg areu arga argb arge arr- arra arrc arre arrg arrr arru arua arub arud arue arug auaa aube auca auce audc aude auer auga auge aur- aura aurd aure auug baaa baad baar baba babb babe babr babu bac- baca bacc bace bada badb badd bade badr badu baed baer baga bage bagg bar- bara barb barc bard bare barg barr baru bau- baud baug baur bbad bbau bbbb bbdd bbeb bbga bbrc bbrg bcaa bcar bcbc bcbg bcca bccc bcda bcde bcec bcer bcra bcru bcuc bd-r bdbc bddc bead beag bear beau beba bebb bebe beca becu beda bede bedu beeb beed beeg beer bega begg begu bera berc berd bere berg berr beru beur bgca brab brac brad brae brag brau brca brcb brce brda brea breb brec bred bree breg brer brrr bruc brud brue brug buad buar buba bubb bube bubu buca bucc buce bucu buda budb budd bude budg budu buea buer bueu buga buge bugg bur- bura burb burd bure burg burr buru c-cd caaa caab caac caba cabe cabg cabu cac- caca cacc cace cacr cada cadc cadd cade cadr cadu caec caer caeu caga cage cagg cagr cara carb carc card care carr cauc cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbdb cbdc cbea cbec cbee cber cbga cbgb cbrd cbre ccaa ccab ccac ccad ccag ccar ccba ccbc ccca cccb cccc cccu ccdc ccdr cced ccee ccga ccgc ccra ccrc ccre ccrg ccuc cd-e cd-r cdaa cdac cdad cdba cdda cddb cddr cdec cder cdre ceac cead cear ceba cebu cec- ceca cece ceda cedd cede cedu ceeb ceec cege cer- cera cerc cerd cere cgac cgcc cgcg cged cger crab crac crag crar crau crbc crbu crca crcc crce crcr crda crdc cre- crea creb crec cred cree creg creu crub crud crue crug cuau