-er bbb bbc bbe bbo bbr bbs bbt bcb bcc bce bcj bco bcr bcs bct be- beb bec bee beo ber bes bet bjc bjj bjr bjs bjt bob boc boe boj boo bor bos bot brb bre brj bro brr brs brt bsb bsc bse bsj bso bsr bss bst btb btc bte bto btr bts btt c-- c-j cbb cbc cbe cbj cbo cbr cbs cbt ccb ccc cce ccj cco ccr ccs cct ce- ceb cec cee cej ceo cer ces cet cjb cjc cjr cjs co- cob coc coe coj coo cor cos cot crb crc cre crj cro crr crs crt csb csc cse csj cso csr css cst ctb ctc cte cto ctr cts ctt ebb ebc ebe ebj ebo ebr ebs ebt ec- ecb ecc ece ecj eco ecr ecs ect eeb eec eee eeo eer ees eet ejc ejo ejt eo- eob eoc eoe eoo eor eos eot erb erc ere ero err ers ert es- esb esc ese eso esr ess est etb etc ete etj eto etr ets ett jbc jbj jbo jbr jbs jbt jcb jcc jce jco jcr jcs jct jeb jec jee jej jeo jer jes jet jjb jjc jjj jjr jjs job joc joe joj joo jor jos jot jrb jrc jro jrr jrs jrt jsb jsc jse jsj jso jsr jss jst jtb jtc jte jtr jts jtt ob- obb obc obe obj obo obr obs obt oc- ocb occ ocj oco ocr ocs oct oeb oec oee oeo oer oes oet ojb ojc oje ojo ojs oo- oob ooc ooo oor oos oot or- orb orc ore oro orr ors ort os- osb osc ose osj oso osr oss ost ot- otb otc ote oto otr ots ott rbb rbc rbe rbo rbr rbs rbt rcb rcc rce rcj rco rcr rcs rct re- reb rec ree reo rer res ret rjc rjr rob roc roe roj roo ror ros rot rrb rrc rrr rrs rrt rsb rsc rse rsj rso rsr rss rst rtb rtc rte rtj rto rtr rts rtt sbb sbc sbe sbj sbo sbr sbs sbt scb scc sce scj sco scr scs sct se- seb sec see sej seo ser ses set sjb sjc sje sjj sjr sjs sjt sob soc soe soj soo sor sos sot sr- srb src sre srj sro srr srs srt ss- ssb ssc sse ssj sso ssr sss sst stb stc ste stj sto str sts stt tbb tbc tbe tbj tbo tbr tbs tbt tcb tcc tce tcj tco tcr tcs tct te- teb tec tee tej teo ter tes tet tjc tje tjo tjr tjs to- tob toc toe toj too tor tos tot trb trc tre tro trr trs trt tsb tsc tse tsj tso tsr tss tst ttb ttc tte tto ttr tts ttt