">)</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># create problem with contiguity constraints that specify that the</span></span></span>
<span class="r-in"><span><span class="co"># planning units used to conserve each feature must form a single</span></span></span>
<span class="r-in"><span><span class="co"># contiguous unit if the planning units are allocated to zones 1 and 2</span></span></span>
<span class="r-in"><span><spa