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using System;
using System.Collections.Generic;
class Test
{
static IEnumerable<int> FromTo (int from, int to)
{
while (from <= to) yield return from++;
}
public static int Main ()
{
IEnumerable<int> e = FromTo (1, 10);
int i = 0;
foreach (int x in e) {
foreach (int y in e) {
i += y;
Console.Write ("{0,3} ", x * y);
}
Console.WriteLine ();
}
Console.WriteLine (i);
if (i != 550)
return i;
return 0;
}
}
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