bbb bbd bbi bbs bbt bdb bdd bdi bds bdt bi- bib bid bii bis bit bsb bsd bsi bss bst btb btd bti bts btt dbb dbd dbi dbs dbt ddb ddd ddi dds ddt di- dib did dii dis dit dsb dsd dsi dss dst dtb dtd dti dts dtt i-d ibb ibd ibi ibs ibt idb idd idi ids idt iib iid iii iis iit is- isb isd isi iss ist itb itd iti its itt sbb sbd sbi sbs sbt sdb sdd sdi sds sdt sib sid sii sis sit ss- ssb ssd ssi sss sst stb std sti sts stt tbb tbd tbi tbs tbt tdb tdd tdi tds tdt tib tid tii tis tit tsb tsd tsi tss tst ttb ttd tti tts ttt