using System;
using System.Linq;
using System.IO;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var str = "I am nice and friendly and I like to wear ninja outfits";
var rx = new Regex(@"(\band\b)");
var res = rx.Split(str).Select(x => x == "and" ? x : !String.IsNullOrWhiteSpace(x) ? "<censured>" : "").ToList();
Console.WriteLine(string.Join("", res));
}
}
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