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Green Xanax is a green 2-milligram dose of active Alprazolam in an elongated rectangular shape. Green Xanax comes in a size of 15.00 mm and is imprinted on the scored side with "S 90 3." Because of the high concentration of Alprazolam in this version of Xanax, it is only available with a legal prescription. Green Xanax Bar is one of the various kinds of Xanax bars. The generic drug Alprazolam is marketed as a Green Xanax bar, a bar of 2-milligram dose of active Alprazolam. Because of the high concentration of Alprazolam in Green Xanax, it is only available with a legal prescription.
An example of an DNA string (whose alphabet contains the symbols A, C, G, and T) is ATGCTTCAGAAAGGTCTTACG.
Given: A DNA string
Return: Four integers corresponding to the number of times that the symbols A, C, G, and T occur in
20 12 17 21