ddd ddi ddo ddr ddx di- did dii dio dir div dix dod doi doo dor dov dox drd dri dro drr drv drx dvd dvi dvr dvx dxd dxi dxo dxr dxx i-d i-v idd idi ido idr idv idx iid iii iio iir iix io- iod ioi ioo ior iov ir- ird iri iro irr irv irx ivd ivi ivo ivr ivv ivx ixi o-i odd odi odo odr odv oid oii oio oir oiv oo- ood ooi ooo oor oov oox or- ord ori oro orr orv orx ov- ovd ovi ovo ovv ox- oxi oxo oxx rdd rdi rdo rdr rdv rdx rid rii rio rir riv rix rod roi roo ror rov rox rrd rri rrr rvd rvi rvo rvr rvv rxr vdd vdi vdo vdr vdv vdx vi- vid vii vio vir viv vix vod voi voo vor vov vox vrd vri vrr vvi vvo vvr vvv vxd vxr vxv xdi xdr xdv xii xio xiv xix xod xoi xoo xor xov xox xrd xrx xvi xxi xxo xxv xxx