bbb bbi bbk bbo bi- bib bii bik bio biv biz bkb bkk bko bkv bob boi bok boo bov boz bvb bvi bvk bvo bvv bzo bzz i-v ibb ibi ibk ibo ibv ibz iib iii iio ikb iki ikk iko ikv io- iob ioi ioo iov ivb ivi ivo ivv izi izo izz k-z kbb kbi kbk kbo kbz kib kii kik kio kiv kiz kkb kki kkk kkv kob koi kok koo koz kvb kvi kvk kvo kvv kzo o-i ob- obb obi obk obo obv oib oii oik oio oiv oiz okb oki okk oko oo- oob ooi ook ooo oov ov- ovb ovi ovo ovv ozo ozz vbi vbk vbo vbv vbz vi- vib vii vik vio viv viz vkb vob voi vok voo vov voz vvb vvi vvo vvv vvz zbb zbv zib zik zio ziv ziz zo- zob zoi zok zoo zvi zzz