0_0_7402999_24958.cpp: In function `int main()':
0_0_7402999_24958.cpp:7: error: `Mat' undeclared (first use this function)
0_0_7402999_24958.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7402999_24958.cpp:7: error: expected `;' before "A"
0_0_7402999_24958.cpp:8: error: `mod' undeclared (first use this function)
0_0_7402999_24958.cpp:9: error: `A' undeclared (first use this function)
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