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<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
  >unsplit :: (Arrow a) =&gt; (b -&gt; c -&gt; d) -&gt; a (b, c) d
unsplit = arr . uncurry       
          -- arr (\op (x,y) -&gt; x `op` y) 
</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 &gt;&gt;&gt; second g
</code
  ></pre
><p
>Block quote:</p
><blockquote
><p
  >foo bar</p
  ></blockquote
>
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