#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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