bbb bbd bbi bbo bbr bbs bdb bdd bdi bdo bdr bds bi- bib bid bii bio bir bis bob bod boi boo bor bos brb brd bri bro brr brs bsb bsd bsi bso bsr bss dbb dbd dbi dbo dbr dbs ddb ddd ddi ddo ddr dds di- dib did dii dio dir dis dob dod doi doo dor dos drb drd dri dro drr drs dsb dsd dsi dso dsr dss i-d ibb ibd ibi ibo ibr ibs idb idd idi ido idr ids iib iid iii iio iir iis io- iob iod ioi ioo ior ios ir- irb ird iri iro irr irs is- isb isd isi iso isr iss o-i ob- obb obd obi obo obr obs odb odd odi odo odr ods oib oid oii oio oir ois oo- oob ood ooi ooo oor oos or- orb ord ori oro orr ors os- osb osd osi oso osr oss rbb rbd rbi rbo rbr rbs rdb rdd rdi rdo rdr rds rib rid rii rio rir ris rob rod roi roo ror ros rrb rrd rri rrr rrs rsb rsd rsi rso rsr rss sbb sbd sbi sbo sbr sbs sdb sdd sdi sdo sdr sds sib sid sii sio sir sis sob sod soi soo sor sos sr- srb srd sri sro srr srs ss- ssb ssd ssi sso ssr sss