HTMLify

func contain(nums []int, target int) bool {
    for _, n := range nums {
        if n == target {
            return true
        }
    }
    return false
}

func twoOutOfThree(nums1 []int, nums2 []int, nums3 []int) []int {
    var distincs []int
    all := [][]int{nums1, nums2, nums3}
    for _, nums := range all {
        for _, n := range nums {
            if !contain(distincs, n) {
                distincs = append(distincs, n)
            }
        }
    }
    var ans []int
    for _, n := range distincs {
        fc := 0
        if contain(nums1, n) {
            fc++
        }
        if contain(nums2, n) {
            fc++
        }
        if contain(nums3, n) {
            fc++
        }
        if fc > 1 {
            ans = append(ans, n)
        }
    }
    return ans
}