-ol bbb bbc bbd bbe bbl bbo bbs bcb bcc bcd bce bcl bco bcs bdb bdc bdd bde bdl bdo bds be- beb bec bed bee bel beo bes blb blc bld ble bll blo bls bob boc bod boe bol boo bos bsb bsc bsd bse bsl bso bss c-- cbb cbc cbd cbe cbl cbo cbs ccb ccc ccd cce ccl cco ccs cdb cdc cdd cde cdl cdo cds ce- ceb cec ced cee cel ceo ces cl- clb clc cld cle cll clo cls co- cob coc cod coe col coo cos csb csc csd cse csl cso css dbb dbc dbd dbe dbl dbo dbs dcb dcc dcd dce dcl dco dcs ddb ddc ddd dde ddl ddo dds de- deb dec ded dee del deo des dl- dlb dlc dld dle dll dlo dls dob doc dod doe dol doo dos dsb dsc dsd dse dsl dso dss ebb ebc ebd ebe ebl ebo ebs ec- ecb ecc ecd ece ecl eco ecs ed- edb edc edd ede edl edo eds eeb eec eed eee eel eeo ees elb elc eld ele ell elo els eo- eob eoc eod eoe eol eoo eos es- esb esc esd ese esl eso ess lbb lbc lbd lbe lbl lbo lbs lcb lcc lcd lce lcl lco lcs ldb ldc ldd lde ldl ldo lds leb lec led lee lel leo les llb llc lld lle lll llo lls lob loc lod loe lol loo los lsb lsc lsd lse lsl lso lss ob- obb obc obd obe obl obo obs oc- ocb occ ocd ocl oco ocs odb odc odd ode odl odo ods oeb oec oed oee oel oeo oes olb olc old ole oll olo ols oo- oob ooc ood ool ooo oos os- osb osc osd ose osl oso oss sbb sbc sbd sbe sbl sbo sbs scb scc scd sce scl sco scs sdb sdc sdd sde sdl sdo sds se- seb sec sed see sel seo ses slb slc sld sle sll slo sls sob soc sod soe sol soo sos ss- ssb ssc ssd sse ssl sso sss