-er a-a a-b a-c aaa aab aac aad aae aaf aar ab- aba abb abc abd abe abf abr ac- aca acb acc acd ace acf acr ad- ada adb adc add ade adf adr aea aeb aec aed aee aef aer af- afa afb afc afd afe aff afr ar- ara arb arc ard are arf arr baa bab bac bad bae baf bar bba bbb bbc bbd bbe bbf bbr bca bcb bcc bcd bce bcf bcr bda bdb bdc bdd bde bdf bdr be- bea beb bec bed bee bef ber bfa bfb bfc bfd bfe bff bfr bra brb brd bre brf brr c-- caa cab cac cad cae caf car cba cbb cbc cbd cbe cbf cbr cca ccb ccc ccd cce ccf ccr cda cdb cdc cdd cde cdf cdr ce- cea ceb cec ced cee cef cer cfa cfb cfc cfd cfe cff cfr cra crb crc crd cre crf crr daa dab dac dad dae daf dar dba dbb dbc dbd dbe dbf dbr dca dcb dcc dcd dce dcf dcr dda ddb ddc ddd dde ddf ddr de- dea deb dec ded dee def der dfa dfb dfc dfd dfe dff dfr dra drb drc drd dre drr eaa eab eac ead eae eaf ear eba ebb ebc ebd ebe ebf ebr ec- eca ecb ecc ecd ece ecf ecr ed- eda edb edc edd ede edf edr eea eeb eec eed eee eef eer ef- efa efb efc efd efe eff efr era erb erc erd ere erf err faa fab fac fad fae faf far fba fbb fbc fbd fbe fbf fbr fca fcb fcc fcd fce fcf fcr fda fdb fdc fdd fde fdf fdr fea feb fec fed fee fef fer ffa ffc ffd ffe fff ffr fra frb frc frd fre frf frr ra- raa rab rac rad rae raf rar rba rbb rbc rbd rbe rbf rbr rca rcb rcc rcd rce rcf rcr rda rdb rdc rdd rde rdf rdr re- rea reb rec red ree ref rer rfa rfb rfc rfd rfe rff rfr rra rrb rrc rrd rrf rrr

a-be aaaa aaab aaac aaad aaae aaaf aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aacf aacr aada aadc aade aaea aaec aafa aafb aafc aafd aaff aara aarc aard aare abaa abab abac abad abae abaf abar abb- abba abbb abbe abbr abca abcb abcc abcd abcf abcr abda abec abed abee aber abff abra abrc acaa acab acac acad acae acar acba acca accc accd acce accf acda acdb acdc acde acdf ace- acea acec aced acer acfc acfd acfe acr- acra acrc acre acrr adaa adab adac adad adae adar adba adbc adcc adda addc addd adde addr adea adeb adee ader adfa adfc adra adre aeac aeaf aecb aede aeer aer- aera aerc aerd afaa afad afar afca afcb afcc afdb afdc afee afer affa affc afr- afra afrc afre arab arac arad arae araf arar arba arbe arc- arca arce arda ardc arde ardf area arec ared aree aref arfa arfb arfc arff arr- arra arrc arre arrr baaa baad baaf baar baba babb babe babr bac- baca bacc bace bada badb badd bade badr baed baer bafc baff bar- bara barb barc bard bare barf barr bbad bbbb bbdd bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcfc bcra bd-r bdbc bddc bead beaf bear beba bebb bebe beca beda bede beeb beed beef beer befa befe beff bera berc berd bere berr bfca brab brac brad brae braf brca brcb brce brda brea breb brec bred bree bref brer brfc brrr c-cd caaa caab caac caaf caba cabe cabf cac- caca cacc cace cacr cada cadc cadd cade cadr caec caer cafa cafb cafc cafe caff cara carb carc card care carf carr cbac cbar cbbc cbca cbcc cbce cbcr cbdb cbdc 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 ccra ccrc ccre ccrf cd-e cd-r cdaa cdac cdad cdba cdbf cdda cddb cddr cdec cdef cder cdfa cdfe cdre ceac cead cear ceba cec- ceca cece ceda cedd cede ceeb ceec cef- cefa cefc cer- cera cerc cerd cere cerf cfaa cfab cfac cfae cfar cfbc cfbr cfca cfcb cfcf cfda cffb cffr cfra cfrb cfre crab crac craf crar crbc crca crcc crce crcr crda crdc cre- crea creb crec cred cree crfc daab daad daae daar daba dabb daca dace dada dade daeb daer dafa dafc dafe daff dara darb darc dard dare darf darr dbar dbcc dbfc dcbc dcca dccb dccc dcdb dcfc dcra dddd ddrc ddre deac dead deae deaf dear deba debe dec- deca decc decd dece deda dedd dede deeb deed deef deer defe deff der- dera derb derc dere derf derr dfaf dfcc dfer dffa dfrf draa drab drac drad draf drar drba drbc drca drda drea dred dree dref drfc drra eaaf eaba eaca eacc eada eadb eadd eaec eafb eara earb eard eare ebac ebba ebbc ebbr ebcc ebed eber ebfc ecaa ecac ecad ecar ecbc ecbe ecca eccb eccc ecce ecdc ecdf eced ecef ecfa ecfc ecfr ecra ecrc ecrf ecrr edac edad edar edca edda eddc edde ede- edea eder edfa edra eeca eede eeea eeee eefa eefe eera eerc efab efbr efca efda effa erad eraf erba erbb erbe erca ercc erce erda erde erdf ereb erec ered erer erfc erra errc erre faaa faac faad faba fabd fabe faca facc face fada fadd fade faeb fafa fafc fafe faff fara farb farc fard fare farr fbar fcab fcar fcba fcca fccf fcda fcra fdca fead feaf fear feba fece feda fede feeb feed feer fefc fefe feff fera ferb ferc ferd fere ferr ffar ffcc ffee ffff ffrr frab frac frad frae frbc frcc frea fred free frfc raab raad raaf raba rabb rabe