-er bbb bbc bbe bbk bbn bbr bbs bcb bcc bce bck bcn bcr bcs be- beb bec bee bek ben ber bes bkb bkc bke bkk bkn bkr bks bnb bnc bne bnk bnn bnr bns brb bre brk brn brr brs bsb bsc bse bsk bsn bsr bss c-- cbb cbc cbe cbk cbn cbr cbs ccb ccc cce cck ccn ccr ccs ce- ceb cec cee cek cen cer ces ckb ckc cks cn- cnb cnc cne cnn cnr cns crb crc cre crk crn crr crs csb csc cse csk csn csr css ebb ebc ebe ebk ebn ebr ebs ec- ecb ecc ece eck ecn ecr ecs eeb eec eee eek een eer ees ekb ekc eke ekr eks en- enb enc ene enk enn enr ens erb erc ere erk ern err ers es- esb esc ese esk esn esr ess kbb kbc kbe kbk kbn kbr kbs kcb kcc kce kck kcn kcr kcs ke- keb kec kee kek ken ker kes kkb kkc kke kkk kkn kkr kks kn- knc kne knk knn knr krc krk krn krr krs ksb ksc kse ksk ksn ksr kss nbb nbc nbe nbk nbn nbr nbs ncb ncc nce nck ncn ncr ncs ne- neb nec nee nek nen ner nes nkc nke nkk nkn nkr nks nnb nnc nne nnk nnn nns nrb nrc nre nrk nrn nrr nrs nsb nsc nse nsk nsn nsr nss rbb rbc rbe rbk rbn rbr rbs rcb rcc rce rcn rcr rcs re- reb rec ree rek ren rer res rkb rkc rke rkk rks rnb rnc rnn rnr rns rrb rrc rrk rrn rrr rrs rsb rsc rse rsk rsn rsr rss sbb sbc sbe sbk sbn sbr sbs scb scc sce sck scn scr scs se- seb sec see sek sen ser ses sk- skb skc ske skk skr sks snb snc sne snk snn snr sns sr- srb src sre srk srn srr srs ss- ssb ssc sse ssk ssn ssr sss

-ene bbbb bbbs bbeb bbrc bcbc bcbs bccc bccs bcec bcer bces bcrs bcsc bcsn bcss bebb bebe beck becs beeb beek been beer bees beke beks bene benk benn bens berc bere berk bern berr bers bes- bese besk bess bner bnrr bnss brcb brce breb brec bree brek bren brer bres brkb brns brrr brrs brsb brsr bscs bseb bsec bsee bser bses bsns bssc bsse cbbc cbbs cbcc cbce cbcn cbcr cbcs cbec cbee cber cbkn cbkr cbre cbrn cbsc cbse cbsn ccbc ccbn cccb cccc cccs ccee ccnb ccnc ccne ccnr ccns ccrc ccre ccrs ccsn ccss cebs cec- cece cecs ceeb ceec cees ceke cen- cene cens cer- cerc cere cern cers cesc cese cesr cess ckbc ckbe ckck ckcs cken cker cknb cknc ckns ckrc cksb cnbc cnes cnrc cnrr cnss crbc crcc crce crcr cre- creb crec cree cren cres crkc crne crns crss cscb cscc csce cscr cscs csec csee cser csks csne csrc csrs csse cssr ebbc ebbr ebbs ebcc eben eber ebes ecbc ecbe eccb eccc ecce eces ecks ecne ecrc ecrr ecsc ecse ecss eecs eeee eees eeke eeks eens eerc eers eese eesk ekeb ekek eken eker ekes ekne enb- enbn enbr ence encs enee ener enes enke enkr ennc enne enns enrs ense erbb erbe ercc erce ereb erec eren erer eres erke erks erne erns errc erre errs erse esbs escb esce escr escs esee esek esen eser eses eske esks esne esse kbbb kbbc kbbe kbbk kbbr kbbs kbcb kbce kbck kbcr kbcs kbeb kbec kbee kbek kben kber kbes kbkb kbkk kbkr kbnn kbnr kbrb kbrc kbre kbrk kbrn kbsb kbsk kbsn kbsr kbss kcbc kcbk kcbr kcbs kccb kccc kcck kccr kceb kcec kcee kckc kckk kckn kckr kcnb kcnr kcns kcrc kcrn kcrr kcrs kcsb kcsc kcse kcsn kcsr kcss kebb kebc kebe kebn kebr keck kecr keek keen keer kees kekb kekc keke keks ken- kene kenk kenn kenr kens ker- kerb kerc kere kerk kern kerr kers kesb kesc kesk kesn kesr kess kkbb kkbe kkbn kkbr kkbs kkcb kkck kkcn kkcr kkcs kken kkkk kknb kkne kknn kkns kkrb kkrc kkre kkrk kkrn kkrr kkrs kkse kksn kksr kkss knbb knbc knbe knbn knbr kncb knce knck kncn kncr kneb knec knee knek knen knes knkk knnb knnk knnr knns knrb knrk knrs knsb knsc knse knsk knsn knsr knss krbb krbe krbk krbr krcb krcc krce krcn krcs kreb krec kree krek kren kres krkc krke krkk krkn krkr krks krnb krne krnk krnn krrb krrc krre krrk krrn krrr krrs krsc krse krsk krsn krsr krss ksbc ksbn ksbr ksbs kscb ksce ksck kscn kscr kscs ksec ksee ksek ksen kser kskb kske kskk kskn kskr ksks ksnb ksnc ksnk ksnn ksnr ksns ksrb ksrn ksrr ksrs ksse kssn kssr ksss nbbc nbcc nbcs nber ncbc ncbs nccc nccn nccr nccs ncec ncee ncen ncer nces ncnc ncrc ncre ncsc ncse ncss nebb nebe nebn nebr nebs necc nece neck necr necs neeb neen neer nees neke nene nens nerc nere nerk nerr ners nesb nesc nese nesn nesr ness nnes nnnn nnss nrcs nren nrrc nrsc nscc nscs nseb nsec nser nskk nsnr nsrc nssb nssc nsse nssr nsss rbbb rbbr rbbs rbss rcbc rccb rccc rccs rcnr rcsc rcss rebb rebe rebk rebs recc rece reck recr recs reeb reek reen rees reke reks rene renk renn rens rere rers rese resn ress rkss rnbr rncs rrrr rscc rscn rscs rsee rsnn rsnr rsre sbbs sbcc sbcs sber sbrk sbse sccc scce sccs scec scee scer sck- scnr scr- scrc scre scrn scrs scsc scsn scsr se-c se-e se-k se-n se-s sebe sebs sec- secc sece seck secn secr secs seeb seec seek seen seer sees seke sekk sene senn senr sens serb serc sere serk sern serr sers sesc sese sess skee sken sker skes skn- skss sncc sneb snee sner snes snns snrk snrs srbc