bbb bbd bbe bbl bbs bdb bdd bde bdl bds be- beb bed bee bel bes blb bld ble bll bls bsb bsd bse bsl bss dbb dbd dbe dbl dbs ddb ddd dde ddl dds de- deb ded dee del des dl- dlb dld dle dll dls dsb dsd dse dsl dss ebb ebd ebe ebl ebs ed- edb edd ede edl eds eeb eed eee eel ees elb eld ele ell els es- esb esd ese esl ess lbb lbd lbe lbl lbs ldb ldd lde ldl lds leb led lee lel les llb lld lle lll lls lsb lsd lse lsl lss sbb sbd sbe sbl sbs sdb sdd sde sdl sds se- seb sed see sel ses slb sld sle sll sls ss- ssb ssd sse ssl sss