-ol bbb bbc bbd bbe bbl bbo bbs bbt bcb bcc bcd bce bcl bco bcs bct bdb bdc bdd bde bdl bdo bds bdt be- beb bec bed bee bel beo bes bet blb blc bld ble bll blo bls blt bob boc bod boe bol boo bos bot bsb bsc bsd bse bsl bso bss bst btb btc btd bte btl bto bts btt c-- cbb cbc cbd cbe cbl cbo cbs cbt ccb ccc ccd cce ccl cco ccs cct cdb cdc cdd cde cdl cdo cds cdt ce- ceb cec ced cee cel ceo ces cet cl- clb clc cld cle cll clo cls clt co- cob coc cod coe col coo cos cot csb csc csd cse csl cso css cst ctb ctc ctd cte ctl cto cts ctt dbb dbc dbd dbe dbl dbo dbs dbt dcb dcc dcd dce dcl dco dcs dct ddb ddc ddd dde ddl ddo dds ddt de- deb dec ded dee del deo des det dl- dlb dlc dld dle dll dlo dls dlt dob doc dod doe dol doo dos dot dsb dsc dsd dse dsl dso dss dst dtb dtc dtd dte dtl dto dts dtt ebb ebc ebd ebe ebl ebo ebs ebt ec- ecb ecc ecd ece ecl eco ecs ect ed- edb edc edd ede edl edo eds edt eeb eec eed eee eel eeo ees eet elb elc eld ele ell elo els elt eo- eob eoc eod eoe eol eoo eos eot es- esb esc esd ese esl eso ess est etb etc etd ete etl eto ets ett lbb lbc lbd lbe lbl lbo lbs lbt lcb lcc lcd lce lcl lco lcs lct ldb ldc ldd lde ldl ldo lds ldt leb lec led lee lel leo les let llb llc lld lle lll llo lls llt lob loc lod loe lol loo los lot lsb lsc lsd lse lsl lso lss lst ltb ltc ltd lte ltl lto lts ltt ob- obb obc obd obe obl obo obs obt oc- ocb occ ocd ocl oco ocs oct odb odc odd ode odl odo ods odt oeb oec oed oee oel oeo oes oet olb olc old ole oll olo ols olt oo- oob ooc ood ool ooo oos oot os- osb osc osd ose osl oso oss ost ot- otb otc otd ote otl oto ots ott sbb sbc sbd sbe sbl sbo sbs sbt scb scc scd sce scl sco scs sct sdb sdc sdd sde sdl sdo sds sdt se- seb sec sed see sel seo ses set slb slc sld sle sll slo sls slt sob soc sod soe sol soo sos sot ss- ssb ssc ssd sse ssl sso sss sst stb stc std ste stl sto sts stt tbb tbc tbd tbe tbl tbo tbs tbt tcb tcc tcd tce tcl tco tcs tct tdb tdc tdd tde tdl tdo tds tdt te- teb tec ted tee tel teo tes tet tlc tld tle tll tlo tls tlt to- tob toc tod toe tol too tos tot tsb tsc tsd tse tsl tso tss tst ttb ttc ttd tte ttl tto tts ttt