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215<h1 id="lhs-test">lhs test</h1>
216<p><code>unsplit</code> is an arrow that takes a pair of values and combines them to
217return a single value:</p>
218<div class="sourceCode" id="cb1"><pre class="sourceCode haskell literate"><code class="sourceCode haskell"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="ot">unsplit ::</span> (<span class="dt">Arrow</span> a) <span class="ot">=></span> (b <span class="ot">-></span> c <span class="ot">-></span> d) <span class="ot">-></span> a (b, c) d</span>
219<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a>unsplit <span class="ot">=</span> arr <span class="op">.</span> <span class="fu">uncurry</span></span>
220<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a> <span class="co">-- arr (\op (x,y) -> x `op` y)</span></span></code></pre></div>
221<p><code>(***)</code> combines two arrows into a new arrow by running the two arrows on a
222pair of values (one arrow on the first item of the pair and one arrow on the
223second item of the pair).</p>
224<pre><code>f *** g = first f >>> second g</code></pre>
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