bbb bbd bbi bbo bbs bdb bdd bdi bdo bds bi- bib bid bii bio bis bob bod boi boo bos bsb bsd bsi bso bss dbb dbd dbi dbo dbs ddb ddd ddi ddo dds di- dib did dii dio dis dob dod doi doo dos dsb dsd dsi dso dss i-d ibb ibd ibi ibo ibs idb idd idi ido ids iib iid iii iio iis io- iob iod ioi ioo ios is- isb isd isi iso iss o-i ob- obb obd obi obo obs odb odd odi odo ods oib oid oii oio ois oo- oob ood ooi ooo oos os- osb osd osi oso oss sbb sbd sbi sbo sbs sdb sdd sdi sdo sds sib sid sii sio sis sob sod soi soo sos ss- ssb ssd ssi sso sss