bbb bbi bbk bbo bbt bi- bib bii bik bio bit biv bkb bkk bko bkt bkv bob boi bok boo bot bov btb bti btk bto btt btv bvb bvi bvk bvo bvt bvv i-v ibb ibi ibk ibo ibt ibv iib iii iio iit ikb iki ikk iko ikt ikv io- iob ioi ioo iot iov itb iti itk ito itt itv ivb ivi ivo ivt ivv k-t kbb kbi kbk kbo kib kii kik kio kit kiv kkb kki kkk kkt kkv kob koi kok koo kot ktb ktk kto ktt ktv kvb kvi kvk kvo kvv o-i ob- obb obi obk obo obt obv oib oii oik oio oit oiv okb oki okk oko oo- oob ooi ook ooo oot oov ot- otb oti otk oto ott otv ov- ovb ovi ovo ovv tbb tbi tbk tbo tbt tbv tib tii tik tio tit tiv tkb tkk tko tkt to- tob toi tok too tot tov ttb tti ttk tto ttt ttv tvb tvi tvk tvo tvt vbi vbk vbo vbv vi- vib vii vik vio vit viv vkb vkt vob voi vok voo vot vov vtb vti vtk vto vtt vtv vvb vvi vvo vvt vvv