bbb bbd bbi bbo bbt bdb bdd bdi bdo bdt bi- bib bid bii bio bit bob bod boi boo bot btb btd bti bto btt dbb dbd dbi dbo dbt ddb ddd ddi ddo ddt di- dib did dii dio dit dob dod doi doo dot dtb dtd dti dto dtt i-d ibb ibd ibi ibo ibt idb idd idi ido idt iib iid iii iio iit io- iob iod ioi ioo iot itb itd iti ito itt o-i ob- obb obd obi obo obt odb odd odi odo odt oib oid oii oio oit oo- oob ood ooi ooo oot ot- otb otd oti oto ott tbb tbd tbi tbo tbt tdb tdd tdi tdo tdt tib tid tii tio tit to- tob tod toi too tot ttb ttd tti tto ttt