-ol bbb bbi bbl bbo bbt bi- bib bii bil bio bit biv blb bli bll blo blt blv bob boi bol boo bot bov btb bti btl bto btt btv bvb bvi bvl bvo bvt bvv i-v ibb ibi ibl ibo ibt ibv iib iii iil iio iit il- ilb ili ill ilo ilt ilv io- iob ioi iol ioo iot iov itb iti itl ito itt itv ivb ivi ivl ivo ivt ivv lbb lbi lbl lbo lbt lbv lib lii lil lio lit liv llb lli lll llo llt llv lob loi lol loo lot lov ltb lti ltl lto ltt ltv lvb lvi lvl lvt lvv o-i ob- obb obi obl obo obt obv oib oii oil oio oit oiv olb oli oll olo olt oo- oob ooi ool ooo oot oov ot- otb oti otl oto ott otv ov- ovb ovi ovl ovo ovv tbb tbi tbl tbo tbt tbv tib tii til tio tit tiv tli tll tlo tlt tlv to- tob toi tol too tot tov ttb tti ttl tto ttt ttv tvb tvi tvl tvo tvt vbi vbl vbo vbv vi- vib vii vil vio vit viv vl- vlb vll vlo vlt vlv vob voi vol voo vot vov vtb vti vtl vto vtt vtv vvb vvi vvo vvt vvv