270505_0_15505.cpp: In function `int ff(int)':
270505_0_15505.cpp:17: error: `f' undeclared (first use this function)
270505_0_15505.cpp:17: error: (Each undeclared identifier is reported only once for each function it appears in.)
270505_0_15505.cpp:17: error: `b' undeclared (first use this function)
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