0_0_12636855_16677.c: In function `main':
0_0_12636855_16677.c:4: error: `i' undeclared (first use in this function)
0_0_12636855_16677.c:4: error: (Each undeclared identifier is reported only once
0_0_12636855_16677.c:4: error: for each function it appears in.)
0_0_12636855_16677.c:4: error: `a' undeclared (first use in this function)
0_0_12636855_16677.c:5: error: `n' undeclared (first use in this function)
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