-er -ol bbb bbe bbl bbo bbr bbs bbt bbx be- beb bee bel beo ber bes bet bex blb ble bll blo blr bls blt blx bob boe bol boo bor bos bot box brb bre brl bro brr brs brt brx bsb bse bsl bso bsr bss bst bsx btb bte btl bto btr bts btt btx bxb bxl bxo bxx ebb ebe ebl ebo ebr ebs ebt ebx eeb eee eel eeo eer ees eet eex elb ele ell elo elr els elt elx eo- eob eoe eol eoo eor eos eot erb ere erl ero err ers ert es- esb ese esl eso esr ess est esx etb ete etl eto etr ets ett etx ex- exe exl exo exr exs ext exx lbb lbe lbl lbo lbr lbs lbt lbx leb lee lel leo ler les let lex llb lle lll llo llr lls llt lob loe lol loo lor los lot lox lrb lro lrr lrs lrt lsb lse lsl lso lsr lss lst ltb lte ltl lto ltr lts ltt ltx lxo lxr lxx ob- obb obe obl obo obr obs obt obx oeb oee oel oeo oer oes oet oex olb ole oll olo ols olt oo- oob ool ooo oor oos oot oox or- orb ore orl oro orr ors ort orx os- osb ose osl oso osr oss ost osx ot- otb ote otl oto otr ots ott ox- oxb oxo oxt oxx rbb rbe rbl rbo rbr rbs rbt rbx re- reb ree rel reo rer res ret rex rle rll rlo rlr rls rlt rob roe rol roo ror ros rot rox rrb rrl rrr rrs rrt rsb rse rsl rso rsr rss rst rsx rtb rte rtl rto rtr rts rtt rtx rxr rxs sbb sbe sbl sbo sbr sbs sbt sbx se- seb see sel seo ser ses set sex slb sle sll slo slr sls slt slx sob soe sol soo sor sos sot sox sr- srb sre srl sro srr srs srt srx ss- ssb sse ssl sso ssr sss sst ssx stb ste stl sto str sts stt stx sxl sxs sxt t-x tbb tbe tbl tbo tbr tbs tbt te- teb tee tel teo ter tes tet tex tle tll tlo tlr tls tlt tlx to- tob toe tol too tor tos tot tox trb tre trl tro trr trs trt trx tsb tse tsl tso tsr tss tst tsx ttb tte ttl tto ttr tts ttt ttx txe txl txs txt xbe xbl xbr xbx xee xel xer xes xet xex xlb xlr xls xlt xoo xor xos xot xox xrt xrx xsb xsl xss xst xtr xts xtx xxl xxo xxx