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The initial re-writing of this part of the code with intervals had to be done with a complex logic (mostly intervals with a lower and upper bound, not a constant value like now) to properly deal with the inefficiencies of the then LZ77 algorithm. The improvements made to LZ77 since, now allow for a simpler logic. There were also small errors in the interval insertion logic that lead to small inefficiencies (hence a slightly better compression rate). Change-Id: If079a0cafaae7be8e3f253485d9015a7177cf973