class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">MutableCollection</span> <span class="p">:</span> <span class="kt">Collection</span> <span class="k">where</span> <span class="k">Self</span><span class="o">.</span><span class="kt">SubSequence</span> <span class="p">:</span> <span class="kt">MutableCollection</span></code></pre>

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