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View Compilation Error

0_0_9081814_21979.cpp: In function `int main()':
0_0_9081814_21979.cpp:65: error: `B' undeclared (first use this function)
0_0_9081814_21979.cpp:65: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9081814_21979.cpp:65: error: `A' undeclared (first use this function)


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