b-u bbb bbd bbi bbn bbu bdb bdd bdi bdu bi- bib bid bii bin biu bnb bnd bni bnn bnu bub bud bui bun buu dbb dbd dbi dbn dbu ddb ddd ddi ddn ddu di- dib did dii din diu dnb dnd dni dnn dub dud dui dun i-d ibb ibd ibi ibn ibu idb idd idi idn idu iib iid iii iin iiu in- inb ind ini inn inu iu- iub iud iui n-i nbb nbd nbi nbn nbu ndb ndd ndi ndn ndu nib nid nii nin niu nnb nni nnn nnu nub nud nui nun nuu ubb ubi ubn ubu udb udd udi udn udu uib uid uii uin uiu un- unb und uni unn unu uun uuu