This R package includes two C header files not written by the package authors:

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src/khash.h:

The copyright for khash.h is held by Attractive Chaos <attractor@live.co.uk>.
khash.h is distributed under the MIT License. 

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src/ksort.h:

The copyright for ksort.h is held by Attractive Chaos <attractor@live.co.uk>.
ksort.h is distributed under the MIT License. 

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