791111_0_0_28503.c: In function `main':
791111_0_0_28503.c:13: error: `up1' undeclared (first use in this function)
791111_0_0_28503.c:13: error: (Each undeclared identifier is reported only once
791111_0_0_28503.c:13: error: for each function it appears in.)
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