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package cap3
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type Pair struct {
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first, second int
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}
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func Ex23(nums []int) [][]int {
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countMap := _makeMatrix(10)
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for _, num1 := range nums {
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for _, num2 := range nums {
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countMap[num1][num2]++
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countMap[num2][num1]++
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}
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}
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return countMap
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}
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