791487_0_0_12393.c: In function `main':
791487_0_0_12393.c:5: error: `b1' undeclared (first use in this function)
791487_0_0_12393.c:5: error: (Each undeclared identifier is reported only once
791487_0_0_12393.c:5: error: for each function it appears in.)
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