-ol bbb bbc bbd bbl bbn bbo bbr bbs bcb bcc bcd bcl bcn bco bcr bcs bdb bdc bdd bdl bdo bdr bds blb blc bld bll bln blo blr bls bnb bnc bnd bnl bnn bno bnr bns bob boc bod bol bon boo bor bos brb brd brl brn bro brr brs bsb bsc bsd bsl bsn bso bsr bss c-- cbb cbc cbd cbl cbn cbo cbr cbs ccb ccc ccd ccl ccn cco ccr ccs cdb cdc cdd cdl cdn cdo cdr cds cl- clb clc cld cll cln clo clr cls cn- cnb cnc cnd cnl cnn cno cnr cns co- cob coc cod col con coo cor cos crb crc crd crl crn cro crr crs csb csc csd csl csn cso csr css dbb dbc dbd dbl dbn dbo dbr dbs dcb dcc dcd dcl dcn dco dcr dcs ddb ddc ddd ddl ddn ddo ddr dds dl- dlb dlc dld dll dlo dlr dls dnb dnc dnd dnl dnn dno dnr dns dob doc dod dol don doo dor dos drb drc drd drl drn dro drr drs dsb dsc dsd dsl dsn dso dsr dss lbb lbc lbd lbl lbo lbr lbs lcb lcc lcd lcl lcn lco lcr lcs ldb ldc ldd ldl ldn ldo ldr lds llb llc lld lll lln llo llr lls lnb lnc lnd lnl lnn lno lnr lns lob loc lod lol lon loo lor los lrb lrc lrd lrn lro lrr lrs lsb lsc lsd lsl lsn lso lsr lss nbb nbc nbd nbl nbn nbo nbr nbs ncb ncc ncd ncl ncn nco ncr ncs ndb ndc ndd ndl ndn ndo ndr nds nlb nlc nld nll nln nlo nlr nls nnb nnc nnl nnn nno nns no- nob noc nod nol non noo nor nos nrb nrc nrd nrl nrn nro nrr nrs nsb nsc nsd nsl nsn nso nsr nss ob- obb obc obd obl obn obo obr obs oc- ocb occ ocd ocl ocn oco ocr ocs odb odc odd odl odn odo odr ods olb olc old oll oln olo ols on- onb onc ond onl onn ono onr ons oo- oob ooc ood ool oon ooo oor oos or- orb orc ord orl orn oro orr ors os- osb osc osd osl osn oso osr oss rbb rbc rbd rbl rbn rbo rbr rbs rcb rcc rcd rcl rcn rco rcr rcs rdb rdc rdd rdl rdn rdo rdr rds rlc rld rll rln rlo rlr rls rnb rnc rnd rnn rno rnr rns rob roc rod rol ron roo ror ros rrb rrc rrd rrl rrn rrr rrs rsb rsc rsd rsl rsn rso rsr rss sbb sbc sbd sbl sbn sbo sbr sbs scb scc scd scl scn sco scr scs sdb sdc sdd sdl sdn sdo sdr sds slb slc sld sll sln slo slr sls snb snc snd snl snn sno snr sns sob soc sod sol son soo sor sos sr- srb src srd srl srn sro srr srs ss- ssb ssc ssd ssl ssn sso ssr sss