b-u bbb bbd bbi bbo bbu bdb bdd bdi bdo bdu bi- bib bid bii bio biu bob bod boi boo bou bub bud bui buo buu dbb dbd dbi dbo dbu ddb ddd ddi ddo ddu di- dib did dii dio diu dob dod doi doo dou dub dud dui duo i-d ibb ibd ibi ibo ibu idb idd idi ido idu iib iid iii iio iiu io- iob iod ioi ioo iou iu- iub iud iui o-i ob- obb obd obi obo obu odb odd odi odo odu oib oid oii oio oiu oo- oob ood ooi ooo ou- oud oui ouo ubb ubi ubo ubu udb udd udi udo udu uib uid uii uio uiu uob uod uoo uuu