bbb bbd bbi bbn bbs bbt bdb bdd bdi bds bdt bi- bib bid bii bin bis bit bnb bnd bni bnn bns bnt bsb bsd bsi bsn bss bst btb btd bti btn bts btt dbb dbd dbi dbn dbs dbt ddb ddd ddi ddn dds ddt di- dib did dii din dis dit dnb dnd dni dnn dns dnt dsb dsd dsi dsn dss dst dtb dtd dti dtn dts dtt i-d ibb ibd ibi ibn ibs ibt idb idd idi idn ids idt iib iid iii iin iis iit in- inb ind ini inn ins int is- isb isd isi isn iss ist itb itd iti itn its itt n-i nbb nbd nbi nbn nbs nbt ndb ndd ndi ndn nds ndt nib nid nii nin nis nit nnb nni nnn nns nnt nsb nsd nsi nsn nss nst ntb ntd nti ntn nts ntt sbb sbd sbi sbn sbs sbt sdb sdd sdi sdn sds sdt sib sid sii sin sis sit snb snd sni snn sns snt ss- ssb ssd ssi ssn sss sst stb std sti stn sts stt tbb tbd tbi tbn tbs tbt tdb tdd tdi tdn tds tdt tib tid tii tin tis tit tnb tnd tni tnn tns tnt tsb tsd tsi tsn tss tst ttb ttd tti ttn tts ttt