-er -ol bbb bbc bbe bbl bbo bbr bbs bbt bcb bcc bce bcl bco bcr bcs bct be- beb bec bee bel beo ber bes bet blb blc ble bll blo blr bls blt bob boc boe bol boo bor bos bot brb bre brl bro brr brs brt bsb bsc bse bsl bso bsr bss bst btb btc bte btl bto btr bts btt c-- cbb cbc cbe cbl cbo cbr cbs cbt ccb ccc cce ccl cco ccr ccs cct ce- ceb cec cee cel ceo cer ces cet cl- clb clc cle cll clo clr cls clt co- cob coc coe col coo cor cos cot crb crc cre crl cro crr crs crt csb csc cse csl cso csr css cst ctb ctc cte ctl cto ctr cts ctt ebb ebc ebe ebl ebo ebr ebs ebt ec- ecb ecc ece ecl eco ecr ecs ect eeb eec eee eel eeo eer ees eet elb elc ele ell elo elr els elt eo- eob eoc eoe eol eoo eor eos eot erb erc ere erl ero err ers ert es- esb esc ese esl eso esr ess est etb etc ete etl eto etr ets ett lbb lbc lbe lbl lbo lbr lbs lbt lcb lcc lce lcl lco lcr lcs lct leb lec lee lel leo ler les let llb llc lle lll llo llr lls llt lob loc loe lol loo lor los lot lrb lrc lro lrr lrs lrt lsb lsc lse lsl lso lsr lss lst ltb ltc lte ltl lto ltr lts ltt ob- obb obc obe obl obo obr obs obt oc- ocb occ ocl oco ocr ocs oct oeb oec oee oel oeo oer oes oet olb olc ole oll olo ols olt oo- oob ooc ool ooo oor oos oot or- orb orc ore orl oro orr ors ort os- osb osc ose osl oso osr oss ost ot- otb otc ote otl oto otr ots ott rbb rbc rbe rbl rbo rbr rbs rbt rcb rcc rce rcl rco rcr rcs rct re- reb rec ree rel reo rer res ret rlc rle rll rlo rlr rls rlt rob roc roe rol roo ror ros rot rrb rrc rrl rrr rrs rrt rsb rsc rse rsl rso rsr rss rst rtb rtc rte rtl rto rtr rts rtt sbb sbc sbe sbl sbo sbr sbs sbt scb scc sce scl sco scr scs sct se- seb sec see sel seo ser ses set slb slc sle sll slo slr sls slt sob soc soe sol soo sor sos sot sr- srb src sre srl sro srr srs srt ss- ssb ssc sse ssl sso ssr sss sst stb stc ste stl sto str sts stt tbb tbc tbe tbl tbo tbr tbs tbt tcb tcc tce tcl tco tcr tcs tct te- teb tec tee tel teo ter tes tet tlc tle tll tlo tlr tls tlt to- tob toc toe tol too tor tos tot trb trc tre trl tro trr trs trt tsb tsc tse tsl tso tsr tss tst ttb ttc tte ttl tto ttr tts ttt