#include <stdio.h>
int odd();
int even();
int n=1;
int odd(){
if(n<=10){
printf("\t%d",n+1);
n++;
even();
}
return 1;
}
int even(){
if (n<=10){
printf("\t%d",n-1);
n++;
odd();
}
return 1;
}
int main() {
odd();
}
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