bbb bbd bbi bbr bbs bdb bdd bdi bdr bds bi- bib bid bii bir bis brb brd bri brr brs bsb bsd bsi bsr bss dbb dbd dbi dbr dbs ddb ddd ddi ddr dds di- dib did dii dir dis drb drd dri drr drs dsb dsd dsi dsr dss i-d ibb ibd ibi ibr ibs idb idd idi idr ids iib iid iii iir iis ir- irb ird iri irr irs is- isb isd isi isr iss rbb rbd rbi rbr rbs rdb rdd rdi rdr rds rib rid rii rir ris rrb rrd rri rrr rrs rsb rsd rsi rsr rss sbb sbd sbi sbr sbs sdb sdd sdi sdr sds sib sid sii sir sis sr- srb srd sri srr srs ss- ssb ssd ssi ssr sss