-ol bbb bbd bbe bbl bbo bbs bbt bdb bdd bde bdl bdo bds bdt be- beb bed bee bel beo bes bet blb bld ble bll blo bls blt bob bod boe bol boo bos bot bsb bsd bse bsl bso bss bst btb btd bte btl bto bts btt dbb dbd dbe dbl dbo dbs dbt ddb ddd dde ddl ddo dds ddt de- deb ded dee del deo des det dl- dlb dld dle dll dlo dls dlt dob dod doe dol doo dos dot dsb dsd dse dsl dso dss dst dtb dtd dte dtl dto dts dtt ebb ebd ebe ebl ebo ebs ebt ed- edb edd ede edl edo eds edt eeb eed eee eel eeo ees eet elb eld ele ell elo els elt eo- eob eod eoe eol eoo eos eot es- esb esd ese esl eso ess est etb etd ete etl eto ets ett lbb lbd lbe lbl lbo lbs lbt ldb ldd lde ldl ldo lds ldt leb led lee lel leo les let llb lld lle lll llo lls llt lob lod loe lol loo los lot lsb lsd lse lsl lso lss lst ltb ltd lte ltl lto lts ltt ob- obb obd obe obl obo obs obt odb odd ode odl odo ods odt oeb oed oee oel oeo oes oet olb old ole oll olo ols olt oo- oob ood ool ooo oos oot os- osb osd ose osl oso oss ost ot- otb otd ote otl oto ots ott sbb sbd sbe sbl sbo sbs sbt sdb sdd sde sdl sdo sds sdt se- seb sed see sel seo ses set slb sld sle sll slo sls slt sob sod soe sol soo sos sot ss- ssb ssd sse ssl sso sss sst stb std ste stl sto sts stt tbb tbd tbe tbl tbo tbs tbt tdb tdd tde tdl tdo tds tdt te- teb ted tee tel teo tes tet tld tle tll tlo tls tlt to- tob tod toe tol too tos tot tsb tsd tse tsl tso tss tst ttb ttd tte ttl tto tts ttt