#include <stdio.h>
int main() {
/*
int i;
for(i=1;i<=10;i++){
printf("%d", i);
}
i = 1;
while(i<11){
printf("%d", i);
i++;
}
printf("\n");
i = 10;
while(i >= 1){
printf("%d", i);
i--;
}
printf("\n");
i = 5;
while(i<=20){
printf("%d\n", i);
i++;
}
i = 1;
while(i<=10){
printf("%d\n", i);
i+=2;
}
*/
}
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