bbb bbe bbf bbl bbs bbt be- beb bee bef bel bes bet bfb bfe bff bfl bfs bft blb ble blf bll bls blt bsb bse bsf bsl bss bst btb bte btf btl bts btt ebb ebe ebf ebl ebs ebt eeb eee eef eel ees eet ef- efb efe eff efl efs eft elb ele elf ell els elt es- esb ese esf esl ess est etb ete etf etl ets ett fbb fbe fbf fbl fbs fbt feb fee fef fel fes fet ffe fff ffl ffs fft flb fle flf fll fls flt fsb fse fsf fsl fss fst ftb fte ftf ftl fts ftt lbb lbe lbf lbl lbs lbt leb lee lef lel les let lfb lfe lff lfl lfs lft llb lle llf lll lls llt lsb lse lsf lsl lss lst ltb lte ltf ltl lts ltt sbb sbe sbf sbl sbs sbt se- seb see sef sel ses set sfb sfe sff sfl sfs sft slb sle slf sll sls slt ss- ssb sse ssf ssl sss sst stb ste stf stl sts stt tbb tbe tbf tbl tbs tbt te- teb tee tef tel tes tet tfb tfe tff tfl tfs tft tle tlf tll tls tlt tsb tse tsf tsl tss tst ttb tte ttf ttl tts ttt