bbb bbi bbl bbr bbt bi- bib bii bil bir bit biv blb bli bll blr blt blv brb bri brl brr brt brv btb bti btl btr btt btv bvb bvi bvl bvr bvt bvv i-v ibb ibi ibl ibr ibt ibv iib iii iil iir iit il- ilb ili ill ilr ilt ilv ir- irb iri irl irr irt irv itb iti itl itt itv ivb ivi ivl ivr ivt ivv lbb lbi lbl lbr lbt lbv lib lii lil lir lit liv llb lli lll llr llt llv lrb lri lrr lrt lrv ltb lti ltl ltr ltt ltv lvb lvi lvl lvr lvt lvv rbb rbi rbl rbr rbt rib rii ril rir rit riv rli rll rlr rlt rrb rri rrl rrr rrt rtb rti rtl rtr rtt rtv rvb rvi rvl rvr rvt rvv tbb tbi tbl tbr tbt tbv tib tii til tir tit tiv tli tll tlr tlt tlv trb tri trl trr trt trv ttb tti ttl ttr ttt ttv tvb tvi tvl tvr tvt vbi vbl vbr vbv vi- vib vii vil vir vit viv vl- vlb vll vlt vlv vrb vri vrr vrt vtb vti vtl vtr vtt vtv vvb vvi vvr vvt vvv