0_0_3276043_23856.c: In function `main':
0_0_3276043_23856.c:13: error: `s1' undeclared (first use in this function)
0_0_3276043_23856.c:13: error: (Each undeclared identifier is reported only once
0_0_3276043_23856.c:13: error: for each function it appears in.)
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