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using System;
class C
{
int value;
string f1 = "f-1";
string f2 = "f=2";
public static string Test1 (string a, string b) => a + "|" + b;
void Test2 (int x) => value = x;
Func<int> Test3 (int a) => () => a;
public static implicit operator string (C c) => "op";
protected string Prop => f1 + " " + f2;
static Func<string> Prop2 => () => "n1";
public int this[int arg1, int arg2] => arg2 - arg1;
int Check ()
{
if (Test1 ("1", "5") != "1|5")
return 1;
Test2 (6);
if (value != 6)
return 2;
if (Test3 (9) () != 9)
return 3;
string s = this;
if (s != "op")
return 4;
if (Prop != "f-1 f=2")
return 5;
if (Prop2 () != "n1")
return 6;
if (this [13, 20] != 7)
return 7;
return 0;
}
static int Main()
{
var c = new C ();
return c.Check ();
}
}
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