bbb bbd bbn bbo bbs bdb bdd bdo bds bnb bnd bnn bno bns bob bod bon boo bos bsb bsd bsn bso bss dbb dbd dbn dbo dbs ddb ddd ddn ddo dds dnb dnd dnn dno dns dob dod don doo dos dsb dsd dsn dso dss nbb nbd nbn nbo nbs ndb ndd ndn ndo nds nnb nnn nno nns no- nob nod non noo nos nsb nsd nsn nso nss ob- obb obd obn obo obs odb odd odn odo ods on- onb ond onn ono ons oo- oob ood oon ooo oos os- osb osd osn oso oss sbb sbd sbn sbo sbs sdb sdd sdn sdo sds snb snd snn sno sns sob sod son soo sos ss- ssb ssd ssn sso sss