-er -ol bbb bbc bbd bbe bbl bbo bbr bbs bcb bcc bcd bce bcl bco bcr bcs bdb bdc bdd bde bdl bdo bdr bds be- beb bec bed bee bel beo ber bes blb blc bld ble bll blo blr bls bob boc bod boe bol boo bor bos brb brd bre brl bro brr brs bsb bsc bsd bse bsl bso bsr bss c-- cbb cbc cbd cbe cbl cbo cbr cbs ccb ccc ccd cce ccl cco ccr ccs cdb cdc cdd cde cdl cdo cdr cds ce- ceb cec ced cee cel ceo cer ces cl- clb clc cld cle cll clo clr cls co- cob coc cod coe col coo cor cos crb crc crd cre crl cro crr crs csb csc csd cse csl cso csr css dbb dbc dbd dbe dbl dbo dbr dbs dcb dcc dcd dce dcl dco dcr dcs ddb ddc ddd dde ddl ddo ddr dds de- deb dec ded dee del deo der des dl- dlb dlc dld dle dll dlo dlr dls dob doc dod doe dol doo dor dos drb drc drd dre drl dro drr drs dsb dsc dsd dse dsl dso dsr dss ebb ebc ebd ebe ebl ebo ebr ebs ec- ecb ecc ecd ece ecl eco ecr ecs ed- edb edc edd ede edl edo edr eds eeb eec eed eee eel eeo eer ees elb elc eld ele ell elo elr els eo- eob eoc eod eoe eol eoo eor eos erb erc erd ere erl ero err ers es- esb esc esd ese esl eso esr ess lbb lbc lbd lbe lbl lbo lbr lbs lcb lcc lcd lce lcl lco lcr lcs ldb ldc ldd lde ldl ldo ldr lds leb lec led lee lel leo ler les llb llc lld lle lll llo llr lls lob loc lod loe lol loo lor los lrb lrc lrd lro lrr lrs lsb lsc lsd lse lsl lso lsr lss ob- obb obc obd obe obl obo obr obs oc- ocb occ ocd ocl oco ocr ocs odb odc odd ode odl odo odr ods oeb oec oed oee oel oeo oer oes olb olc old ole oll olo ols oo- oob ooc ood ool ooo oor oos or- orb orc ord ore orl oro orr ors os- osb osc osd ose osl oso osr oss rbb rbc rbd rbe rbl rbo rbr rbs rcb rcc rcd rce rcl rco rcr rcs rdb rdc rdd rde rdl rdo rdr rds re- reb rec red ree rel reo rer res rlc rld rle rll rlo rlr rls rob roc rod roe rol roo ror ros rrb rrc rrd rrl rrr rrs rsb rsc rsd rse rsl rso rsr rss sbb sbc sbd sbe sbl sbo sbr sbs scb scc scd sce scl sco scr scs sdb sdc sdd sde sdl sdo sdr sds se- seb sec sed see sel seo ser ses slb slc sld sle sll slo slr sls sob soc sod soe sol soo sor sos sr- srb src srd sre srl sro srr srs ss- ssb ssc ssd sse ssl sso ssr sss