using System;
using System.Collections.Generic;
using System.Collections;
public static class CollectionUtils
{
public static T[] Join(params IEnumerable[] srcs)
{
if (srcs.Length == 0)
return new T[0];
List res = new List(srcs[0]);
for (int i = 1; i < srcs.Length; i++)
res.AddRange(srcs[i]);
return res.ToArray();
}
}