Answer Posted / r@m$

#include<stdio.h>
void main(){
int x=0,y=0;
while(y<20){
for(x=0;x<6;x++){
y++;
printf("%d\t",y);
}
y-=5;
for(x=0;x<5;x++){
y+=2;
printf("%d\t",y);
}
y-=7;
for(x=0;x<4;x++){
y+=4;
printf("%d\t",y);
}
}
}

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