0_0_12636923_8852.c: In function `main':
0_0_12636923_8852.c:42: error: `a' undeclared (first use in this function)
0_0_12636923_8852.c:42: error: (Each undeclared identifier is reported only once
0_0_12636923_8852.c:42: error: for each function it appears in.)
0_0_12636923_8852.c:42: error: syntax error before '}' token
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