bbb bbd bbi bbr bbs bbt bdb bdd bdi bdr bds bdt bi- bib bid bii bir bis bit brb brd bri brr brs brt bsb bsd bsi bsr bss bst btb btd bti btr bts btt dbb dbd dbi dbr dbs dbt ddb ddd ddi ddr dds ddt di- dib did dii dir dis dit drb drd dri drr drs drt dsb dsd dsi dsr dss dst dtb dtd dti dtr dts dtt i-d ibb ibd ibi ibr ibs ibt idb idd idi idr ids idt iib iid iii iir iis iit ir- irb ird iri irr irs irt is- isb isd isi isr iss ist itb itd iti its itt rbb rbd rbi rbr rbs rbt rdb rdd rdi rdr rds rdt rib rid rii rir ris rit rrb rrd rri rrr rrs rrt rsb rsd rsi rsr rss rst rtb rtd rti rtr rts rtt sbb sbd sbi sbr sbs sbt sdb sdd sdi sdr sds sdt sib sid sii sir sis sit sr- srb srd sri srr srs srt ss- ssb ssd ssi ssr sss sst stb std sti str sts stt tbb tbd tbi tbr tbs tbt tdb tdd tdi tdr tds tdt tib tid tii tir tis tit trb trd tri trr trs trt tsb tsd tsi tsr tss tst ttb ttd tti ttr tts ttt