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Exercise 6.5 (P168)

The type of each word used by IntSet is uint64, but 64-bit arithmetic may be inefficient on a 32-bit platform. Modify the program to use the uint type, which is the most efficient unsigned integer type for the platform. Instead of dividing by 64, define a constant holding the effective size of uint in bits, 32 or 64. You can use the perhaps too-clever expression `32 << (^uint(0) >> 63) for this purpose.