0_0_7631009_20353.cpp: In function `int main()':
0_0_7631009_20353.cpp:25: error: `a' undeclared (first use this function)
0_0_7631009_20353.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7631009_20353.cpp:25: error: `b' undeclared (first use this function)
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