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using System ;
class Program
{
static void Main()
{
int [] [] a;
int [] b;
a = new int [2] [];
b = a [0] = new int [] {1, 2};
a [1] = new int [] {3, 4};
a [0] = a [1]; a [1] = b;
Console.Write( "{0} {1}", a [0] [0], a [0] [1]);
Console.Write( "{0} {1}", a [1] [0], a [1] [1]);
}
}
(**CharpBase**)