span>, <span class="op">-</span><span class="op">(</span><span class="va">year</span><span class="op">:</span><span class="va">day</span><span class="op">)</span><span class="op">]</span></span>
<span><span class="va">flights</span><span class="op">[</span>, <span class="op">!</span><span class="op">(</span><span class="va">year</span><span class="op">:</span><span class="va">day</span><span class="op">)</span><span class="op">]</span></span>
<span></span>
<span><span class="co"># tidyfst</span></span>
<spa