bbb bbd bbi bbo bdb bdd bdi bdo bdv bi- bib bid bii bio biv bob bod boi boo bov bvb bvd bvi bvo bvv dbb dbd dbi dbo dbv ddb ddd ddi ddo di- dib did dii dio div dob dod doi doo dov dvb dvd dvi i-d i-v ibb ibd ibi ibo ibv idb idd idi ido idv iib iid iii iio io- iob iod ioi ioo iov ivb ivd ivi ivo ivv o-i ob- obb obd obi obo obv odb odd odi odo odv oib oid oii oio oiv oo- oob ood ooi ooo oov ov- ovb ovd ovi ovo ovv vbd vbi vbo vbv vdb vdd vdi vdo vdv vi- vib vid vii vio viv vob vod voi voo vov vvb vvi vvo vvv