Endless vowels, especially "U"

Is the iPhone version of the game programmed to give human users (playing against the computer) as many letter Us and I’s as possible? Im serious; hardly a game goes by that I am not given 3 or 4 Us and I’s, often at the same time, turn after turn. Guaranteed by the end of the game I will have more Us and I’s in my tray than any other letters. It just does not seem random.

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