<h1 id="lhs-test" >lhs test</h1 ><p ><code >unsplit</code > is an arrow that takes a pair of values and combines them to return a single value:</p ><pre class="sourceCode haskell" ><code >> <span class="ot" >unsplit </span ><span class="ot" >::</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<br />> unsplit <span class="fu" >=</span > arr <span class="fu" >.</span > <span class="fu" >uncurry</span > <br />> <span class="co" >-- arr (\op (x,y) -> x `op` y) </span ><br /></code ></pre ><p ><code >(***)</code > combines two arrows into a new arrow by running the two arrows on a pair of values (one arrow on the first item of the pair and one arrow on the second item of the pair).</p ><pre ><code >f *** g = first f >>> second g </code ></pre ><p >Block quote:</p ><blockquote ><p >foo bar</p ></blockquote >