-er a-a a-b a-c aaa aab aac aad aae aaf aak aar aas ab- aba abb abc abd abe abf abk abr abs ac- aca acb acc acd ace acf ack acr acs ad- ada adb adc add ade adf adk adr ads aea aeb aec aed aee aef aek aer aes af- afa afb afc afd afe aff afk afr afs aka akb akc akd ake akk akr aks ar- ara arb arc ard are arf ark arr ars as- asa asb asc asd ase asf ask asr ass baa bab bac bad bae baf bak bar bas bba bbb bbc bbd bbe bbf bbk bbr bbs bca bcb bcc bcd bce bcf bck bcr bcs bda bdb bdc bdd bde bdf bdk bdr bds be- bea beb bec bed bee bef bek ber bes bfa bfb bfc bfd bfe bff bfr bfs bka bkb bkc bke bkf bkk bkr bks bra brb brd bre brf brk brr brs bsa bsb bsc bsd bse bsf bsk bsr bss c-- caa cab cac cad cae caf cak car cas cba cbb cbc cbd cbe cbf cbk cbr cbs cca ccb ccc ccd cce ccf cck ccr ccs cda cdb cdc cdd cde cdf cdk cdr cds ce- cea ceb cec ced cee cef cek cer ces cfa cfb cfc cfd cfe cff cfk cfr cfs cka ckb ckc ckd cks cra crb crc crd cre crf crk crr crs csa csb csc csd cse csf csk csr css daa dab dac dad dae daf dak dar das dba dbb dbc dbd dbe dbf dbk dbr dbs dca dcb dcc dcd dce dcf dck dcr dcs dda ddb ddc ddd dde ddf ddk ddr dds de- dea deb dec ded dee def dek der des dfa dfb dfc dfd dfe dff dfk dfr dfs dka dkb dkc dke dkk dkr dks dra drb drc drd dre drk drr drs dsa dsb dsc dsd dse dsf dsk dsr dss eaa eab eac ead eae eaf eak ear eas eba ebb ebc ebd ebe ebf ebk ebr ebs ec- eca ecb ecc ecd ece ecf eck ecr ecs ed- eda edb edc edd ede edf edk edr eds eea eeb eec eed eee eef eek eer ees ef- efa efb efc efd efe eff efr efs eka ekb ekc ekd eke ekf ekr eks era erb erc erd ere erf erk err ers es- esa esb esc esd ese esf esk esr ess faa fab fac fad fae faf fak far fas fba fbb fbc fbd fbe fbf fbk fbr fbs fca fcb fcc fcd fce fcf fck fcr fcs fda fdb fdc fdd fde fdf fdk fdr fds fea feb fec fed fee fef fek fer fes ffa ffc ffd ffe fff ffk ffr ffs fka fkb fkc fkf fkk fra frb frc frd fre frf frk frr frs fsa fsb fsc fsd fse fsf fsk fsr fss ka- kaa kab kac kad kae kaf kak kar kas kba kbb kbc kbd kbe kbf kbk kbr kbs kca kcb kcc kcd kce kck kcr kcs kda kdb kdc kde kdf kdk kdr kds ke- kea keb kec ked kee kef kek ker kes kfa kfc kfd kff kfs kkb kkc kke kkk kkr kks kra krc krd krf krk krr krs ksa ksb ksc ksd kse ksf ksk ksr kss ra- raa rab rac rad rae raf rak rar ras rba rbb rbc rbd rbe rbf rbk rbr rbs rca rcb rcc rcd rce rcf rcr rcs rda rdb rdc rdd rde rdf rdr rds re- rea reb rec red ree ref rek rer res rfa rfb rfc rfd rfe rff rfk rfr rfs rkb rkc rke rkf rkk rks rra rrb rrc rrd rrf rrk rrr rrs rsa rsb rsc rsd rse rsf rsk rsr rss saa sab sac sad sae saf sak sar sas sba sbb sbc sbd sbe sbf sbk sbr sbs sca scb scc scd sce scf sck scr scs sda sdb sdc sdd sde sdf sdk sdr sds se- sea seb sec sed see sef sek ser ses sfa sfb sfc sfd sfe sff sfk sfr sfs sk- ska skb skc skd ske skf skk skr sks sr- sra srb src srd sre srf srk srr srs ss- ssa ssb ssc ssd sse ssf ssk ssr sss

-ase a-ak a-be aaaa aaab aaac aaad aaae aaaf aaar aaas aaba aabb aabc aabd aaca aacb aacc aacd aace aacf aack aacr aacs aada aadc aade aads aaea aaec aaes aafa aafb aafc aafd aaff aaka aake aara aarc aard aare aars aasa aasc aasd aase aasf aass abaa abab abac abad abae abaf abak abar abas abb- abba abbb abbe abbr abbs abca abcb abcc abcd abcf abcr abcs abda abec abed abee aber abes abff abra abrc abrs abs- absa absd abse absf abss acaa acab acac acad acae acar acas acba acca accc accd acce accf accs acda acdb acdc acde acdf acds ace- acea acec aced acek acer aces acfc acfd acfe acfs ackd acke acks acr- acra acrc acre acrr acrs acsa acsc acsd acse acss adaa adab adac adad adae adak adar adas adba adbc adcc adcs adda addc addd adde addr adds adea adeb adee ader ades adfa adfc adfs adra adre adrs adsa adsr adss aeac aeaf aeas aebs aecb aede aeer aeka aer- aera aerc aerd aers aesc aesd aess afaa afad afak afar afbs afca afcb afcc afcs afdb afdc afee afek afer afes affa affc affs afka afkr afr- afra afrc afre afrs afsa afsb afsc akaa akae akar akas akca aked akee aker akes akka akr- akra akre aksa arab arac arad arae araf arak arar aras arba arbe arbs arc- arca arce arcs arda ardc arde ardf ards area arec ared aree aref arek ares arfa arfb arfc arff arfs arka arke arks arr- arra arrc arre arrk arrr arrs ars- arsa arsc arsd arse arsk asaa asab asac asad asae asaf asak asar asas asba