bbb bbd bbe bbl bbt bdb bdd bde bdl bdt be- beb bed bee bel bet blb bld ble bll blt btb btd bte btl btt dbb dbd dbe dbl dbt ddb ddd dde ddl ddt de- deb ded dee del det dl- dlb dld dle dll dlt dtb dtd dte dtl dtt ebb ebd ebe ebl ebt ed- edb edd ede edl edt eeb eed eee eel eet elb eld ele ell elt etb etd ete etl ett lbb lbd lbe lbl lbt ldb ldd lde ldl ldt leb led lee lel let llb lld lle lll llt ltb ltd lte ltl ltt tbb tbd tbe tbl tbt tdb tdd tde tdl tdt te- teb ted tee tel tet tld tle tll tlt ttb ttd tte ttl ttt