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void setup() {
pinMode (10,OUTPUT);
pinMode (9,OUTPUT);
pinMode (8,OUTPUT);
pinMode (7,OUTPUT);
pinMode (6,OUTPUT);
}

void loop() {
int i=0;
delay (500);
for(int a=6;a<=10;a++)
{
digitalWrite (a, HIGH);
delay (500);
digitalWrite (a, LOW);
}
for (int a=6;a<=10;a++)
{
digitalWrite(a,LOW);
delay (500);
}


for (int a=6;a<=10;a++)
{
digitalWrite(a,HIGH);

}
delay (500);


}