#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
int n;
int i,j;
for (i=0; i<n; i++) {
for (j=0; j<2*n-1; j++) {
if (j+i<n) {
else if (i+n-1==j) {
}
else
{
}
}
}
return 0;
}
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