-er bbb bbc bbe bbn bbo bbr bbs bbt bcb bcc bce bcj bcn bco bcr bcs bct be- beb bec bee ben beo ber bes bet bjc bjj bjn bjr bjs bjt bnb bnc bne bnj bnn bno bnr bns bnt bob boc boe boj bon boo bor bos bot brb bre brj brn bro brr brs brt bsb bsc bse bsj bsn bso bsr bss bst btb btc bte btn bto btr bts btt c-- c-j cbb cbc cbe cbj cbn cbo cbr cbs cbt ccb ccc cce ccj ccn cco ccr ccs cct ce- ceb cec cee cej cen ceo cer ces cet cjb cjc cjr cjs cn- cnb cnc cne cnj cnn cno cnr cns cnt co- cob coc coe coj con coo cor cos cot crb crc cre crj crn cro crr crs crt csb csc cse csj csn cso csr css cst ctb ctc cte ctn cto ctr cts ctt ebb ebc ebe ebj ebn ebo ebr ebs ebt ec- ecb ecc ece ecj ecn eco ecr ecs ect eeb eec eee een eeo eer ees eet ejc ejo ejt en- enb enc ene enn eno enr ens ent eo- eob eoc eoe eon eoo eor eos eot erb erc ere ern ero err ers ert es- esb esc ese esn eso esr ess est etb etc ete etj etn eto etr ets ett jbc jbj jbo jbr jbs jbt jcb jcc jce jco jcr jcs jct jeb jec jee jej jen jeo jer jes jet jjb jjc jjj jjr jjs jnc jne jnj jnn jno jnr jns jnt job joc joe joj jon joo jor jos jot jrb jrc jrn jro jrr jrs jrt jsb jsc jse jsj jsn jso jsr jss jst jtb jtc jte jtn jtr jts jtt nbb nbc nbe nbn nbo nbr nbs nbt ncb ncc nce ncn nco ncr ncs nct ne- neb nec nee nej nen neo ner nes net njc nje njn njs nnb nnc nne nnn nno nns nnt no- nob noc noe noj non noo nor nos not nrb nrc nre nrj nrn nro nrr nrs nrt nsb nsc nse nsn nso nsr nss nst ntb ntc nte ntn nto ntr nts ntt ob- obb obc obe obj obn obo obr obs obt oc- ocb occ ocj ocn oco ocr ocs oct oeb oec oee oen oeo oer oes oet ojb ojc oje ojo ojs on- onb onc one onj onn ono onr ons ont oo- oob ooc oon ooo oor oos oot or- orb orc ore orn oro orr ors ort os- osb osc ose osj osn oso osr oss ost ot- otb otc ote otn oto otr ots ott rbb rbc rbe rbn rbo rbr rbs rbt rcb rcc rce rcj rcn rco rcr rcs rct re- reb rec ree ren reo rer res ret rjc rjr rnb rnc rnn rno rnr rns rnt rob roc roe roj ron roo ror ros rot rrb rrc rrn rrr rrs rrt rsb rsc rse rsj rsn rso rsr rss rst rtb rtc rte rtj rtn rto rtr rts rtt sbb sbc sbe sbj sbn sbo sbr sbs sbt scb scc sce scj scn sco scr scs sct se- seb sec see sej sen seo ser ses set sjb sjc sje sjj sjr sjs sjt snb snc sne snj snn sno snr sns snt sob soc soe soj son soo sor sos sot sr- srb src sre srj srn sro srr srs srt ss- ssb ssc sse ssj ssn sso ssr sss sst stb stc ste stj stn sto str sts stt tbb tbc tbe tbj tbn tbo tbr tbs tbt tcb tcc tce tcj tcn tco tcr tcs tct te- teb tec tee tej ten teo ter tes tet tjc tje tjo tjr tjs tnb tnc tne tnn tno tnr tns tnt to- tob toc toe toj ton too tor tos tot trb trc tre trn tro trr trs trt tsb tsc tse tsj tsn tso tsr tss tst ttb ttc tte ttn tto ttr tts ttt