508452_0_0_17049.cpp: In function `int main()':
508452_0_0_17049.cpp:16: error: `b' undeclared (first use this function)
508452_0_0_17049.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
508452_0_0_17049.cpp:16: error: `c' undeclared (first use this function)
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