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+lhs test
+========
+
+``unsplit`` is an arrow that takes a pair of values and combines them to
+return a single value:
+
+.. code:: haskell
+
+    unsplit :: (Arrow a) => (b -> c -> d) -> a (b, c) d
+    unsplit = arr . uncurry
+              -- arr (\op (x,y) -> x `op` y)
+
+``(***)`` 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).
+
+::
+
+    f *** g = first f >>> second g
+
+Block quote:
+
+    foo bar