b-u bbb bbd bbi bbo bbr bbu bdb bdd bdi bdo bdr bdu bi- bib bid bii bio bir biu bob bod boi boo bor bou brb brd bri bro brr bru bub bud bui buo bur buu dbb dbd dbi dbo dbr dbu ddb ddd ddi ddo ddr ddu di- dib did dii dio dir diu dob dod doi doo dor dou drb drd dri dro drr dru dub dud dui duo dur i-d ibb ibd ibi ibo ibr ibu idb idd idi ido idr idu iib iid iii iio iir iiu io- iob iod ioi ioo ior iou ir- irb ird iri iro irr iru iu- iub iud iui iur o-i ob- obb obd obi obo obr obu odb odd odi odo odr odu oib oid oii oio oir oiu oo- oob ood ooi ooo oor or- orb ord ori oro orr oru ou- oud oui ouo our rbb rbd rbi rbo rbr rbu rdb rdd rdi rdo rdr rdu rib rid rii rio rir rob rod roi roo ror rou rrb rrd rri rrr rru rub rud rui ruo rur ruu ubb ubi ubo ubr ubu udb udd udi udo udr udu uib uid uii uio uir uiu uob uod uoo uor ur- urb urd uri uro urr uru uur uuu