bbb bbi bbr bbs bbt bi- bib bii bir bis bit biv brb bri brr brs brt brv bsb bsi bsr bss bst bsv btb bti btr bts btt btv bvb bvi bvr bvs bvt bvv i-v ibb ibi ibr ibs ibt ibv iib iii iir iis iit ir- irb iri irr irs irt irv is- isb isi isr iss ist isv itb iti its itt itv ivb ivi ivr ivs ivt ivv rbb rbi rbr rbs rbt rib rii rir ris rit riv rrb rri rrr rrs rrt rsb rsi rsr rss rst rsv rtb rti rtr rts rtt rtv rvb rvi rvr rvs rvt rvv sbb sbi sbr sbs sbt sbv sib sii sir sis sit siv sr- srb sri srr srs srt srv ss- ssb ssi ssr sss sst ssv stb sti str sts stt stv svb svi svr svs svt svv tbb tbi tbr tbs tbt tbv tib tii tir tis tit tiv trb tri trr trs trt trv tsb tsi tsr tss tst tsv ttb tti ttr tts ttt ttv tvb tvi tvr tvs tvt vbi vbr vbs vbv vi- vib vii vir vis vit viv vrb vri vrr vrs vrt vsb vsi vsr vss vst vsv vtb vti vtr vts vtt vtv vvb vvi vvr vvs vvt vvv