-er b-u bbb bbe bbi bbl bbm bbr bbs bbt bbu be- beb bee bei bel bem ber bes bet beu bi- bib bie bii bil bim bir bis bit biu blb ble bli bll blm blr bls blt blu bmb bme bmi bml bmm bmr bms bmt bmu brb bre bri brl brm brr brs brt bru bsb bse bsi bsl bsm bsr bss bst bsu btb bte bti btl btm btr bts btt btu bub bue bui bul bum bur bus but buu ebb ebe ebi ebl ebm ebr ebs ebt ebu eeb eee eel eem eer ees eet eib eie eii eil eim eir eis eit eiu elb ele eli ell elm elr els elt elu em- emb eme emi eml emm emr ems emt emu erb ere eri erl erm err ers ert eru es- esb ese esi esl esm esr ess est esu etb ete eti etl etm etr ets ett etu eu- eub eue eui eul eur eus eut ibb ibe ibi ibl ibm ibr ibs ibt ibu ie- iee iei iel iem ier ies iet iib iie iii iil iim iir iis iit iiu il- ilb ile ili ill ilm ilr ils ilt ilu im- imb ime imi iml imm ims imt imu ir- irb ire iri irl irm irr irs irt iru is- isb ise isi isl ism isr iss ist isu itb ite iti itl itm its itt itu iu- iub iue iui ium iur ius iut lbb lbe lbi lbl lbm lbr lbs lbt lbu leb lee lei lel lem ler les let leu lib lie lii lil lim lir lis lit liu llb lle lli lll llm llr lls llt llu lmb lme lmi lml lmm lmr lms lmt lmu lrb lri lrm lrr lrs lrt lru lsb lse lsi lsl lsm lsr lss lst lsu ltb lte lti ltl ltm ltr lts ltt ltu lub lue lui lul lum lur lus lut luu m-r mbb mbe mbi mbl mbm mbr mbs mbt mbu meb mee mei mel mem mer mes met meu mi- mib mie mii mil mim mir mis mit miu mlb mle mli mll mlm mlr mls mlt mlu mmb mme mmi mml mmm mmr mms mmt mmu mrb mre mri mrl mrm mrr mrs mrt mru msb mse msi msl msm msr mss mst msu mtb mte mti mtl mtm mtr mts mtt mtu mub mue mui mul mum mur mus mut muu rbb rbe rbi rbl rbm rbr rbs rbt rbu re- reb ree rei rel rem rer res ret reu rib rie rii ril rim rir ris rit rle rli rll rlm rlr rls rlt rlu rmb rme rmi rml rmm rmr rms rmt rrb rri rrl rrm rrr rrs rrt rru rsb rse rsi rsl rsm rsr rss rst rsu rtb rte rti rtl rtm rtr rts rtt rtu rub rue rui rum rur rus rut ruu sbb sbe sbi sbl sbm sbr sbs sbt sbu se- seb see sei sel sem ser ses set seu sib sie sii sil sim sir sis sit siu slb sle sli sll slm slr sls slt slu smb sme smi sml smm smr sms smt smu sr- srb sre sri srl srm srr srs srt ss- ssb sse ssi ssl ssm ssr sss sst ssu stb ste sti stl stm str sts stt stu sub sue sui sul sum sur sus sut suu tbb tbe tbi tbl tbm tbr tbs tbt tbu te- teb tee tei tel tem ter tes tet teu tib tie tii til tim tir tis tit tiu tle tli tll tlm tlr tls tlt tlu tmb tme tmi tml tmm tmr tms tmt tmu trb tre tri trl trm trr trs trt tru tsb tse tsi tsl tsm tsr tss tst tsu ttb tte tti ttl ttm ttr tts ttt ttu tub tue tui tul tum tur tus tut tuu ubb ube ubi ubl ubr ubs ubt ubu ueb uee uei uel uem uer ues uet uib uie uii uil uim uir uis uit uiu ulb ule uli ull ulm ulr uls ult ulu um- umb ume umi uml umm umr ums umt umu ur- urb ure uri url urm urr urs urt uru usb use usi usl usm usr uss ust usu utb ute uti utl utm utr uts utt utu uue uum uur uus uut uuu