bbb bbd bbi bbo bbr bbx bdb bdd bdi bdo bdr bdx bi- bib bid bii bio bir bix bob bod boi boo bor box brb brd bri bro brr brx bxb bxd bxi bxo bxx dbb dbd dbi dbo dbr dbx ddb ddd ddi ddo ddr ddx di- dib did dii dio dir dix dob dod doi doo dor dox drb drd dri dro drr drx dxd dxi dxo dxr dxx i-d ibb ibd ibi ibo ibr ibx idb idd idi ido idr idx iib iid iii iio iir iix io- iob iod ioi ioo ior ir- irb ird iri iro irr irx ixi o-i ob- obb obd obi obo obr obx odb odd odi odo odr oib oid oii oio oir oo- oob ood ooi ooo oor oox or- orb ord ori oro orr orx ox- oxb oxi oxo oxx rbb rbd rbi rbo rbr rbx rdb rdd rdi rdo rdr rdx rib rid rii rio rir rix rob rod roi roo ror rox rrb rrd rri rrr rxr xbr xbx xdb xdi xdr xii xio xix xod xoi xoo xor xox xrd xrx xxi xxo xxx