you don't really wanna boil the grains mate. the temp to aim for is 155 or so to extract both the flavor and convert the starch to sugar which can be fermented.
boiling the flaked barley with the wort would be like making oatmeal in your wort. it's all protien and gelatin type stuff floating in your beer now. it shouldn't hurt it since it was boiled, but ideally you should shy away from boilng grains to such an extent 
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A barrel of malt, a bushel of hops, you stir it around with a stick
The kind of lubrication to make your engine tick
never argue with an idiot, they'll just drag you down to their level and beat you with experience.
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