judy: Judy (Sparse Dynamic Array Library)
judy:
judy: Judy is a C library that provides a state-of-the-art  core technology
judy: that   implements a sparse dynamic array. Judy  arrays  are  declared
judy: simply with a null pointer. A Judy array consumes memory only when it
judy: is populated, yet can grow  to take advantage of all available memory
judy: if desired.
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judy:
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