5-2.linq

<Query Kind="Program" />

void Main()
{
    string inputString = 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    int niceCount = 0;
    foreach (var input in inputString.Split(';'))
    {
        bool condition1 = false;
        bool condition2 = false;
        Dictionary<string, List<int>> pairs = new Dictionary<string, List<int>>();
        for (int i = 0; i < input.Length - 1; i++)
        {
            string pair = new string(new char[] { input[i], input[i + 1] });
            if (!pairs.ContainsKey(pair)) pairs.Add(pair, new List<int>());
            pairs[pair] = pairs[pair].Concat(new[] { i, i+1 }).ToList();
            
            if (i + 2 < input.Length && input[i] == input[i + 2]) condition2 = true;
        }
        if (pairs.Values.Any(indexes => indexes.Distinct().Count() >= 4)) condition1 = true;
        if (condition1 && condition2) niceCount++;
    }
    niceCount.Dump();
}