ss="r-pr">#&gt;</span> [1] 0 3 3 0</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $P</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>      X0.Y00 X1.Y00 X0.Y10 X1.Y10 X0.Y01 X1.Y01 X0.Y11 X1.Y11</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> X.0       1      0      1      0      1      0      1      0</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> X.1       0      1      0      1      0  