package cap3

type Pair struct {
    first, second int
}

func Ex23(nums []int) [][]int {
    countMap := _makeMatrix(10)

    for _, num1 := range nums {
        for _, num2 := range nums {
            countMap[num1][num2]++
            countMap[num2][num1]++
        }
    }

    return countMap
}