b-u bbb bbe bbf bbl bbm bbs bbt bbu be- beb bee bef bel bem bes bet beu bfb bfe bff bfl bfm bfs bft bfu blb ble blf bll blm bls blt blu bmb bme bmf bml bmm bms bmt bmu bsb bse bsf bsl bsm bss bst bsu btb bte btf btl btm bts btt btu bub bue buf bul bum bus but buu ebb ebe ebf ebl ebm ebs ebt ebu eeb eee eef eel eem ees eet ef- efb efe eff efl efm efs eft elb ele elf ell elm els elt elu em- emb eme emf eml emm ems emt emu es- esb ese esf esl esm ess est esu etb ete etf etl etm ets ett etu eu- eub eue euf eul eus eut fbb fbe fbf fbl fbm fbs fbt fbu feb fee fef fel fem fes fet feu ffe fff ffl ffm ffs fft ffu flb fle flf fll flm fls flt flu fmb fme fmf fml fmm fms fmt fmu fsb fse fsf fsl fsm fss fst fsu ftb fte ftf ftl ftm fts ftt ftu fub fue fuf ful fum fus fut fuu lbb lbe lbf lbl lbm lbs lbt lbu leb lee lef lel lem les let leu lfb lfe lff lfl lfm lfs lft lfu llb lle llf lll llm lls llt llu lmb lme lmf lml lmm lms lmt lmu lsb lse lsf lsl lsm lss lst lsu ltb lte ltf ltl ltm lts ltt ltu lub lue luf lul lum lus lut luu m-f mbb mbe mbf mbl mbm mbs mbt mbu meb mee mef mel mem mes met meu mfb mfe mff mfl mfm mfs mft mfu mlb mle mlf mll mlm mls mlt mlu mmb mme mmf mml mmm mms mmt mmu msb mse msf msl msm mss mst msu mtb mte mtf mtl mtm mts mtt mtu mub mue muf mul mum mus mut muu sbb sbe sbf sbl sbm sbs sbt sbu se- seb see sef sel sem ses set seu sfb sfe sff sfl sfm sfs sft sfu slb sle slf sll slm sls slt slu smb sme smf sml smm sms smt smu ss- ssb sse ssf ssl ssm sss sst ssu stb ste stf stl stm sts stt stu sub sue suf sul sum sus sut suu tbb tbe tbf tbl tbm tbs tbt tbu te- teb tee tef tel tem tes tet teu tfb tfe tff tfl tfm tfs tft tfu tle tlf tll tlm tls tlt tlu tmb tme tmf tml tmm tms tmt tmu tsb tse tsf tsl tsm tss tst tsu ttb tte ttf ttl ttm tts ttt ttu tub tue tuf tul tum tus tut tuu ubb ube ubf ubl ubs ubt ubu ueb uee uef uel uem ues uet ufe uff ufl ufm ufs uft ufu ulb ule ulf ull ulm uls ult ulu um- umb ume umf uml umm ums umt umu usb use usf usl usm uss ust usu utb ute utf utl utm uts utt utu uue uum uus uut uuu