0_0_2007298_1954.c: In function `main':
0_0_2007298_1954.c:11: error: `sum' undeclared (first use in this function)
0_0_2007298_1954.c:11: error: (Each undeclared identifier is reported only once
0_0_2007298_1954.c:11: error: for each function it appears in.)
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