b-u bbb bbd bbi bbo bbt bbu bdb bdd bdi bdo bdt bdu bi- bib bid bii bio bit biu bob bod boi boo bot bou btb btd bti bto btt btu bub bud bui buo but buu dbb dbd dbi dbo dbt dbu ddb ddd ddi ddo ddt ddu di- dib did dii dio dit diu dob dod doi doo dot dou dtb dtd dti dto dtt dtu dub dud dui duo dut i-d ibb ibd ibi ibo ibt ibu idb idd idi ido idt idu iib iid iii iio iit iiu io- iob iod ioi ioo iot iou itb itd iti ito itt itu iu- iub iud iui iut o-i ob- obb obd obi obo obt obu odb odd odi odo odt odu oib oid oii oio oit oiu oo- oob ood ooi ooo oot ot- otb otd oti oto ott otu ou- oud oui ouo out tbb tbd tbi tbo tbt tbu tdb tdd tdi tdo tdt tdu tib tid tii tio tit tiu to- tob tod toi too tot tou ttb ttd tti tto ttt ttu tub tud tui tuo tut tuu ubb ubi ubo ubt ubu udb udd udi udo udt udu uib uid uii uio uit uiu uob uod uoo uot utb utd uti uto utt utu uut uuu