0_0_7928721_28047.cpp: In function `int main()':
0_0_7928721_28047.cpp:29: error: `mark' undeclared (first use this function)
0_0_7928721_28047.cpp:29: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7928721_28047.cpp:30: error: `mark1' undeclared (first use this function)
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