bbb bbd bbi bbo bbt bbx bdb bdd bdi bdo bdt bdx bi- bib bid bii bio bit bix bob bod boi boo bot box btb btd bti bto btt btx bxb bxd bxi bxo bxx dbb dbd dbi dbo dbt dbx ddb ddd ddi ddo ddt ddx di- dib did dii dio dit dix dob dod doi doo dot dox dtb dtd dti dto dtt dtx dxd dxi dxo dxt dxx i-d ibb ibd ibi ibo ibt ibx idb idd idi ido idt idx iib iid iii iio iit iix io- iob iod ioi ioo iot itb itd iti ito itt itx ixi o-i ob- obb obd obi obo obt obx odb odd odi odo odt oib oid oii oio oit oo- oob ood ooi ooo oot oox ot- otb otd oti oto ott ox- oxb oxi oxo oxt oxx t-x tbb tbd tbi tbo tbt tdb tdd tdi tdo tdt tdx tib tid tii tio tit tix to- tob tod toi too tot tox ttb ttd tti tto ttt ttx txi txt xbx xdb xdi xdt xii xio xit xix xod xoi xoo xot xox xti xtx xxi xxo xxx