162688_0_27837.c: In function `main':
162688_0_27837.c:10: error: `r' undeclared (first use in this function)
162688_0_27837.c:10: error: (Each undeclared identifier is reported only once
162688_0_27837.c:10: error: for each function it appears in.)
162688_0_27837.c:13: error: `t' undeclared (first use in this function)
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