0_0_11683044_15189.cpp:3: error: `M' was not declared in this scope
0_0_11683044_15189.cpp:4: error: `N' was not declared in this scope
0_0_11683044_15189.cpp: In function `int main()':
0_0_11683044_15189.cpp:17: error: `a' undeclared (first use this function)
0_0_11683044_15189.cpp:17: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11683044_15189.cpp:19: error: `f' undeclared (first use this function)
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