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Design a data structure for a directory. The root directory is A, A has three subdirectories, B, C and D; B has three subdirectories, B1,

Design a data structure for a directory. The root directory is A, A has three subdirectories, B, C and D; B has three subdirectories, B1, B2 and B3; C has no subdirectories; D has two subdirectories, D1 and D2; B2 has two subdirectories, B21 and B22; D2 has one subdirectory, D21; D21 has three subdirectories, D211, D212 and D213. Please draw the sc.

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