62422_0_5493.c: In function `main':
62422_0_5493.c:6: error: `a' undeclared (first use in this function)
62422_0_5493.c:6: error: (Each undeclared identifier is reported only once
62422_0_5493.c:6: error: for each function it appears in.)
62422_0_5493.c:6: error: `b' undeclared (first use in this function)
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