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2419     * as the "minimum sum of absolute differences" heuristic.  Other
2420 * heuristics are the "weighted minimum sum of absolute differences"
2429 * (1) minimum sum of absolute differences from running average (i.e.,
2430 * keep running sum of non-absolute differences & count of bytes)
2433 * (1b) minimum sum of absolute differences from sliding average, probably
2436 * (2) minimum sum of squared differences from zero or running average