14) How many strings of length 12 over the alphabet {a, b, c, d} start with "aa" or end with "aa" or both? a. 2.4¹0 +48 b. 2.410 48 - c. 2. (¹22).4¹0 + (12).48 d. 2. (¹2). 4¹0 (12) 48 -

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