-er bbb bbc bbd bbe bbk bbr bbs bcb bcc bcd bce bck bcr bcs bdb bdc bdd bde bdk bdr bds be- beb bec bed bee bek ber bes bkb bkc bke bkk bkr bks brb brd bre brk brr brs bsb bsc bsd bse bsk bsr bss c-- cbb cbc cbd cbe cbk cbr cbs ccb ccc ccd cce cck ccr ccs cdb cdc cdd cde cdk cdr cds ce- ceb cec ced cee cek cer ces ckb ckc ckd cks crb crc crd cre crk crr crs csb csc csd cse csk csr css dbb dbc dbd dbe dbk dbr dbs dcb dcc dcd dce dck dcr dcs ddb ddc ddd dde ddk ddr dds de- deb dec ded dee dek der des dkb dkc dke dkk dkr dks drb drc drd dre drk drr drs dsb dsc dsd dse dsk dsr dss ebb ebc ebd ebe ebk ebr ebs ec- ecb ecc ecd ece eck ecr ecs ed- edb edc edd ede edk edr eds eeb eec eed eee eek eer ees ekb ekc ekd eke ekr eks erb erc erd ere erk err ers es- esb esc esd ese esk esr ess kbb kbc kbd kbe kbk kbr kbs kcb kcc kcd kce kck kcr kcs kdb kdc kde kdk kdr kds ke- keb kec ked kee kek ker kes kkb kkc kke kkk kkr kks krc krd krk krr krs ksb ksc ksd kse ksk ksr kss rbb rbc rbd rbe rbk rbr rbs rcb rcc rcd rce rcr rcs rdb rdc rdd rde rdr rds re- reb rec red ree rek rer res rkb rkc rke rkk rks rrb rrc rrd rrk rrr rrs rsb rsc rsd rse rsk rsr rss sbb sbc sbd sbe sbk sbr sbs scb scc scd sce sck scr scs sdb sdc sdd sde sdk sdr sds se- seb sec sed see sek ser ses sk- skb skc skd ske skk skr sks sr- srb src srd sre srk srr srs ss- ssb ssc ssd sse ssk ssr sss

bbbb bbbs bbdd bbeb bbrc bcbc bcbs bccc bccs bcde bcds bcec bcer bces bcrs bcsc bcss bd-r bdbc bddc bdes bdsd bebb bebe beck becs bede beds beeb beed beek beer bees beke beks berc berd bere berk berr bers bes- bese besk bess brcb brce brds breb brec bred bree brek brer bres brkb brrr brrs brsb brsr bsbd bscs bseb bsec bsed bsee bser bses bsrd bssc bssd bsse c-cd cbbc cbbs cbcc cbce cbcr cbcs cbdb cbdc cbds cbec cbee cber cbkr cbrd cbre cbsc cbse ccbc cccb cccc cccs ccdc ccdr ccds cced ccee ccrc ccre ccrs ccsd ccss cd-e cd-r cdcs cddb cddr cdec cder cdes cdre cdrs cdss cebs cec- cece cecs cedd cede ceeb ceec cees ceke cer- cerc cerd cere cers cesc cese cesr cess ckbc ckbe ckck ckcs cker ckrc ckrd cksb crbc crcc crce crcr crdc cre- creb crec cred cree cres crkc crss cscb cscc cscd csce cscr cscs csdb csdr csec csee cser csks csrc csrd csrs cssd csse cssr dbcc dbcs dbrs dbss dcbc dccb dccc dccs dcdb dcds dcrk dcsc dcss dddd ddes ddrc ddre ddss debe debs dec- decc decd dece deck decs dedd dede deeb deed deek deer dees dek- deke deks der- derb derc dere derk derr ders des- desc dese desk dess dkdc drbc dred dree drek dres drrs dsbc dscc dscr dscs dsdr dsrc dsrr dssc ebbc ebbr ebbs ebcc ebed eber ebes ecbc ecbe eccb eccc ecce ecdc eced eces ecks ecrc ecrr ecsc ecse ecss eddc edde edds ede- eder edes edss eecs eede eeee eees eeke eeks eerc eers eese eesk ekeb eked ekek eker ekes erbb erbe ercc erce erde erds ereb erec ered erer eres erke erks errc erre errs erse esbs escb esce escr escs esds esee esek eser eses eske esks esrd esse kbbb kbbc kbbd kbbe kbbk kbbr kbbs kbcb kbce kbck kbcr kbcs kbdb kbde kbdr kbds kbeb kbec kbed kbee kbek kber kbes kbkb kbkk kbkr kbrb kbrc kbrd kbre kbrk kbsb kbsk kbsr kbss kcbc kcbd kcbk kcbr kcbs kccb kccc kccd kcck kccr kcdc kcdd kcdr kcds kceb kcec kced kcee kckc kckk kckr kcrc kcrr kcrs kcsb kcsc kcsd kcse kcsr kcss kdbb kdbr kdbs kdcc kdcd kdce kdcr kddb kddc kddd kddk kddr kdeb kdec kdkb kdkd kdkk kdkr kdrb kdrs kdsc kdsd kdsk kdsr kdss kebb kebc kebe kebr keck kecr kedb kedc kedd kede kedr keds keed keek keer kees kekb kekc keke keks ker- kerb kerc kere kerk kerr kers kesb kesc kesd kesk kesr kess kkbb kkbd kkbe kkbr kkbs kkcb kkcd kkck kkcr kkcs kkdc kkdd kked kkkk kkrb kkrc kkre kkrk kkrr kkrs kksd kkse kksr kkss krbb krbd krbe krbk krbr krcb krcc krcd krce krcs krdc krdd krde krdr krds kreb krec kred kree krek kres krkc krkd krke krkk krkr krks krrb krrc krre krrk krrr krrs krsc krsd krse krsk krsr krss ksbc ksbr ksbs kscb ksce ksck kscr kscs ksdc ksdk ksdr ksds ksec ksed ksee ksek kser kskb kskd kske kskk kskr ksks ksrb ksrr ksrs ksse kssr ksss rbbb rbbr rbbs rbds rbsd rbss rcbc rccb rccc rccs rcdc rcde rcds rcrd rcsc rcsd rcss rder rebb rebe rebk rebs recc recd rece reck recr recs redc redd rede redr reds reeb reed reek rees reke reks rerd rere rers rese ress rkss rred rrrr rscc rscs rsdd rsds rsee rsre sbbs sbcc sbcs sbds sber sbrk sbsd sbse sccc scce sccs scdc scds scec scee scer sck- scr- scrc scre scrs scsc scsd scsr sdcc sddc sdds sder sdes sdrc sdrs sdsc sdss se-c se-d se-e se-k se-s sebe sebs sec- secc secd sece seck secr secs sede seds seeb seec seed seek seer sees seke sekk serb serc serd sere serk serr sers sesc sese sess sked skee sker skes sksd skss srbc srcc srde sreb srec sres srsd ssbr