#include <stdio.h>
int main() {
int a = 3;
int b = 3;
switch (a) {
case 0:
break;
case 1:
break;
case 2:
switch (b) {
case 0:
case 1:
case 2:
default:
printf("aもbもゼロでも1でも2でもありません\n");
break;
}
return 0;
}
}
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