bbb bbe bbf bbl bbs be- beb bee bef bel bes bfb bfe bff bfl bfs blb ble blf bll bls bsb bse bsf bsl bss ebb ebe ebf ebl ebs eeb eee eef eel ees ef- efb efe eff efl efs elb ele elf ell els es- esb ese esf esl ess fbb fbe fbf fbl fbs feb fee fef fel fes ffe fff ffl ffs flb fle flf fll fls fsb fse fsf fsl fss lbb lbe lbf lbl lbs leb lee lef lel les lfb lfe lff lfl lfs llb lle llf lll lls lsb lse lsf lsl lss sbb sbe sbf sbl sbs se- seb see sef sel ses sfb sfe sff sfl sfs slb sle slf sll sls ss- ssb sse ssf ssl sss