258785_0_8281.c: In function `main':
258785_0_8281.c:4: error: `a' undeclared (first use in this function)
258785_0_8281.c:4: error: (Each undeclared identifier is reported only once
258785_0_8281.c:4: error: for each function it appears in.)
258785_0_8281.c:4: error: `b' undeclared (first use in this function)
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