f a binary multiple time series:</p>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span> <span class="n">windowID</span><span class="o">&lt;</span><span class="n">sep</span><span class="o">&gt;</span><span class="p">(</span><span class="n">item</span><span class="p">,</span><span class="n">timestamp</span><span class="p">)</span><span class="o">&lt;</span><span class="n">sep</span><span class="o">&gt;</span><span class="p">(</span