bbb bbd bbn bbo bbs bbt bdb bdd bdo bds bdt bnb bnd bnn bno bns bnt bob bod bon boo bos bot bsb bsd bsn bso bss bst btb btd btn bto bts btt dbb dbd dbn dbo dbs dbt ddb ddd ddn ddo dds ddt dnb dnd dnn dno dns dnt dob dod don doo dos dot dsb dsd dsn dso dss dst dtb dtd dtn dto dts dtt nbb nbd nbn nbo nbs nbt ndb ndd ndn ndo nds ndt nnb nnn nno nns nnt no- nob nod non noo nos not nsb nsd nsn nso nss nst ntb ntd ntn nto nts ntt ob- obb obd obn obo obs obt odb odd odn odo ods odt on- onb ond onn ono ons ont oo- oob ood oon ooo oos oot os- osb osd osn oso oss ost ot- otb otd otn oto ots ott sbb sbd sbn sbo sbs sbt sdb sdd sdn sdo sds sdt snb snd snn sno sns snt sob sod son soo sos sot ss- ssb ssd ssn sso sss sst stb std stn sto sts stt tbb tbd tbn tbo tbs tbt tdb tdd tdn tdo tds tdt tnb tnd tnn tno tns tnt to- tob tod ton too tos tot tsb tsd tsn tso tss tst ttb ttd ttn tto tts ttt