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string[] a = { "aa", "ba", "da" };
string[] b = { "ab", "bb", "db" };
string[] c = { "ac", "bc", "dc" };
var r = new[] { a, b, c }.Aggregate(new string[]{}, (x, y) => x.Concat(y).ToArray());
Console.WriteLine(string.Join(",", r));
picture0.Union(picture1).Union(picture2).ToArray();