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export default function removeCoveredIntervals(intervals: number[][]): number {    intervals.sort((a, b) => a[0] == b[0] ? b[1] - a[1] : a[0] - b[0]);    let deleted = 0, pre = intervals[0][1];    for (let i = 1; i < intervals.length; i++) {        if (intervals[i][1] <= pre) deleted++;        else pre = intervals[i][1];    }    return intervals.length - deleted;}