#define FOO
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#ifdef FOO
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int a;
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int b;
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#undef FOO
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#ifndef FOO
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int c;
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int d;
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#else
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int e;
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int f;
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#endif
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int e;
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int f;
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#ifdef FOO
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int c_;
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int d_;
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#else
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int e_;
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int f_;
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#endif
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int e_;
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int f_;
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int
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main()
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{
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return 0;
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}
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#else
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int j;
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int k;
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#ifdef FOO
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int j;
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int k;
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#else
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int n;
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int o;
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#endif
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int n;
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int o;
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#ifndef FOO
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int r;
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int s;
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#else
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int t;
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int u;
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#endif
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int t;
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int u;
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#error bad branch
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#endif
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