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func generate(numRows int) [][]int {
    tri := make([][]int, numRows)
    for i := 0; i < numRows; i++ {
        tri[i] = make([]int, i+1)
        tri[i][0], tri[i][i] = 1, 1
        for j := 1; j < i; j++ {
            tri[i][j] = tri[i-1][j-1] + tri[i-1][j]
        }
    }
    return tri
}