#include <stdio.h>
void writeX(int n) {
int i;
for( i = 0; i < n; i++ ) {
}
}
void figure(int n) {
if(n==1) writeX(n);
else {
figure(n-1);
writeX(n);
figure(n-1);
}
}
int main(void) {
int n;
figure(n);
return 0;
}
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