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histogram.c: - Verified (earlier) that there's low correlation between Red & Blue colors (particularly after applying Cross-color transform). The Bin based histogram merge, bins on three entropies viz literal, red & blue symbols. Removing either of blue or red increases the compression density. So keeping the bins for red & blue sybmols. - Keeping the compact bins method as-is. This way it's simpler to read. huffman_encode.h: Added field comments for struct HuffmanTree and removed the TODO. Change-Id: Ia76f7bc730079d1b3b644038c5d9931db3797f0e