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-# AFL N-Gram Branch Coverage
-
-## Source
-
-This is an LLVM-based implementation of the n-gram branch coverage proposed in
-the paper ["Be Sensitive and Collaborative: Analzying Impact of Coverage Metrics
-in Greybox Fuzzing"](https://www.usenix.org/system/files/raid2019-wang-jinghan.pdf),
-by Jinghan Wang, et. al.
-
-Note that the original implementation (available
-[here](https://github.com/bitsecurerlab/afl-sensitive))
-is built on top of AFL's QEMU mode.
-This is essentially a port that uses LLVM vectorized instructions to achieve
-the same results when compiling source code.
-
-In math the branch coverage is performed as follows:
-`map[current_location ^ prev_location[0] >> 1 ^ prev_location[1] >> 1 ^ ... up to n-1`] += 1`
-
-## Usage
-
-The size of `n` (i.e., the number of branches to remember) is an option
-that is specified either in the `AFL_LLVM_INSTRUMENT=NGRAM-{value}` or the
-`AFL_LLVM_NGRAM_SIZE` environment variable.
-Good values are 2, 4 or 8, valid are 2-16.
-
-It is highly recommended to increase the MAP_SIZE_POW2 definition in
-config.h to at least 18 and maybe up to 20 for this as otherwise too
-many map collisions occur.