commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/IntStatistics.java [752:771]:
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    public IntStatistics combine(IntStatistics other) {
        // Check compatibility
        Statistics.checkCombineCompatible(min, other.min);
        Statistics.checkCombineCompatible(max, other.max);
        Statistics.checkCombineCompatible(sum, other.sum);
        Statistics.checkCombineCompatible(product, other.product);
        Statistics.checkCombineCompatible(sumOfSquares, other.sumOfSquares);
        Statistics.checkCombineCompatible(sumOfLogs, other.sumOfLogs);
        Statistics.checkCombineAssignable(moment, other.moment);
        // Combine
        count += other.count;
        Statistics.combine(min, other.min);
        Statistics.combine(max, other.max);
        Statistics.combine(sum, other.sum);
        Statistics.combine(product, other.product);
        Statistics.combine(sumOfSquares, other.sumOfSquares);
        Statistics.combine(sumOfLogs, other.sumOfLogs);
        Statistics.combineMoment(moment, other.moment);
        return this;
    }
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commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/DoubleStatistics.java [712:731]:
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    public DoubleStatistics combine(DoubleStatistics other) {
        // Check compatibility
        Statistics.checkCombineCompatible(min, other.min);
        Statistics.checkCombineCompatible(max, other.max);
        Statistics.checkCombineCompatible(sum, other.sum);
        Statistics.checkCombineCompatible(product, other.product);
        Statistics.checkCombineCompatible(sumOfSquares, other.sumOfSquares);
        Statistics.checkCombineCompatible(sumOfLogs, other.sumOfLogs);
        Statistics.checkCombineAssignable(moment, other.moment);
        // Combine
        count += other.count;
        Statistics.combine(min, other.min);
        Statistics.combine(max, other.max);
        Statistics.combine(sum, other.sum);
        Statistics.combine(product, other.product);
        Statistics.combine(sumOfSquares, other.sumOfSquares);
        Statistics.combine(sumOfLogs, other.sumOfLogs);
        Statistics.combineMoment(moment, other.moment);
        return this;
    }
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commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/LongStatistics.java [730:749]:
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    public LongStatistics combine(LongStatistics other) {
        // Check compatibility
        Statistics.checkCombineCompatible(min, other.min);
        Statistics.checkCombineCompatible(max, other.max);
        Statistics.checkCombineCompatible(sum, other.sum);
        Statistics.checkCombineCompatible(product, other.product);
        Statistics.checkCombineCompatible(sumOfSquares, other.sumOfSquares);
        Statistics.checkCombineCompatible(sumOfLogs, other.sumOfLogs);
        Statistics.checkCombineAssignable(moment, other.moment);
        // Combine
        count += other.count;
        Statistics.combine(min, other.min);
        Statistics.combine(max, other.max);
        Statistics.combine(sum, other.sum);
        Statistics.combine(product, other.product);
        Statistics.combine(sumOfSquares, other.sumOfSquares);
        Statistics.combine(sumOfLogs, other.sumOfLogs);
        Statistics.combineMoment(moment, other.moment);
        return this;
    }
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