-er -ol b-u bbb bbe bbf bbl bbo bbr bbs bbt bbu be- beb bee bef bel beo ber bes bet beu bfb bfe bff bfl bfo bfr bfs bft bfu blb ble blf bll blo blr bls blt blu bob boe bof bol boo bor bos bot bou brb bre brf brl bro brr brs brt bru bsb bse bsf bsl bso bsr bss bst bsu btb bte btf btl bto btr bts btt btu bub bue buf bul buo bur bus but buu ebb ebe ebf ebl ebo ebr ebs ebt ebu eeb eee eef eel eeo eer ees eet ef- efb efe eff efl efo efr efs eft elb ele elf ell elo elr els elt elu eo- eob eoe eof eol eoo eor eos eot eou erb ere erf erl ero err ers ert eru es- esb ese esf esl eso esr ess est esu etb ete etf etl eto etr ets ett etu eu- eub eue euf eul eur eus eut fbb fbe fbf fbl fbo fbr fbs fbt fbu feb fee fef fel feo fer fes fet feu ffe fff ffl ffo ffr ffs fft ffu flb fle flf fll flo flr fls flt flu fob foe fof fol foo for fos fot fou frb fre frf frl fro frr frs frt fru fsb fse fsf fsl fso fsr fss fst fsu ftb fte ftf ftl fto ftr fts ftt ftu fub fue fuf ful fuo fur fus fut fuu lbb lbe lbf lbl lbo lbr lbs lbt lbu leb lee lef lel leo ler les let leu lfb lfe lff lfl lfo lfr lfs lft lfu llb lle llf lll llo llr lls llt llu lob loe lof lol loo lor los lot lou lrb lrf lro lrr lrs lrt lru lsb lse lsf lsl lso lsr lss lst lsu ltb lte ltf ltl lto ltr lts ltt ltu lub lue luf lul luo lur lus lut luu ob- obb obe obf obl obo obr obs obt obu oeb oee oef oel oeo oer oes oet of- ofb ofe off ofl ofo ofr ofs oft ofu olb ole olf oll olo ols olt olu oo- oob oof ool ooo oor oos oot or- orb ore orf orl oro orr ors ort oru os- osb ose osf osl oso osr oss ost osu ot- otb ote otf otl oto otr ots ott otu ou- oue ouf oul ouo our ous out rbb rbe rbf rbl rbo rbr rbs rbt rbu re- reb ree ref rel reo rer res ret reu rfb rfe rff rfl rfo rfr rfs rft rfu rle rlf rll rlo rlr rls rlt rlu rob roe rof rol roo ror ros rot rou rrb rrf rrl rrr rrs rrt rru rsb rse rsf rsl rso rsr rss rst rsu rtb rte rtf rtl rto rtr rts rtt rtu rub rue ruf ruo rur rus rut ruu sbb sbe sbf sbl sbo sbr sbs sbt sbu se- seb see sef sel seo ser ses set seu sfb sfe sff sfl sfo sfr sfs sft sfu slb sle slf sll slo slr sls slt slu sob soe sof sol soo sor sos sot sou sr- srb sre srf srl sro srr srs srt ss- ssb sse ssf ssl sso ssr sss sst ssu stb ste stf stl sto str sts stt stu sub sue suf sul suo sur sus sut suu tbb tbe tbf tbl tbo tbr tbs tbt tbu te- teb tee tef tel teo ter tes tet teu tfb tfe tff tfl tfo tfr tfs tft tfu tle tlf tll tlo tlr tls tlt tlu to- tob toe tof tol too tor tos tot tou trb tre trf trl tro trr trs trt tru tsb tse tsf tsl tso tsr tss tst tsu ttb tte ttf ttl tto ttr tts ttt ttu tub tue tuf tul tuo tur tus tut tuu ubb ube ubf ubl ubo ubr ubs ubt ubu ueb uee uef uel uer ues uet ufe uff ufl ufo ufr ufs uft ufu ulb ule ulf ull ulo ulr uls ult ulu uob uoe uol uoo uor uos uot ur- urb ure urf url uro urr urs urt uru usb use usf usl uso usr uss ust usu utb ute utf utl uto utr uts utt utu uue uur uus uut uuu