-ol bbb bbd bbk bbl bbm bbo bbs bdb bdd bdk bdl bdm bdo bds bkb bkk bkl bkm bko bks blb bld blk bll blm blo bls bmb bmd bmk bml bmm bmo bms bob bod bok bol bom boo bos bsb bsd bsk bsl bsm bso bss dbb dbd dbk dbl dbm dbo dbs ddb ddd ddk ddl ddm ddo dds dkb dkk dkl dkm dko dks dl- dlb dld dlk dll dlm dlo dls dmb dmd dmk dml dmm dmo dms dob dod dok dol dom doo dos dsb dsd dsk dsl dsm dso dss kbb kbd kbk kbl kbm kbo kbs kdb kdk kdl kdm kdo kds kkb kkk kkl kkm kks kl- klb kld klm klo kls kmb kmd kmk kml kmm kmo kms kob kod kok kol kom koo kos ksb ksd ksk ksl ksm kso kss lbb lbd lbk lbl lbm lbo lbs ldb ldd ldk ldl ldm ldo lds lkb lkl lks llb lld llk lll llm llo lls lmb lmd lmk lml lmm lmo lms lob lod lok lol lom loo los lsb lsd lsk lsl lsm lso lss m-o mbb mbd mbk mbl mbm mbo mbs mdb mdd mdk mdl mdm mdo mds mkb mkd mkk mkl mkm mko mks mlb mld mlk mll mlm mlo mls mmb mmd mmk mml mmm mmo mms mob mod mok mol mom moo mos msb msd msk msl msm mso mss ob- obb obd obk obl obm obo obs odb odd odl odm odo ods okb okd okk okl oko oks olb old olk oll olm olo ols om- omb omd oml omm omo oms oo- oob ood ook ool oom ooo oos os- osb osd osk osl osm oso oss sbb sbd sbk sbl sbm sbo sbs sdb sdd sdk sdl sdm sdo sds sk- skb skd skk skl skm sko sks slb sld slk sll slm slo sls smb smd smk sml smm smo sms sob sod sok sol som soo sos ss- ssb ssd ssk ssl ssm sso sss