void setup() {
  // put your setup code here, to run once:
  //Q.3 write a program to run pattern(s)LEDS connect at 
 // pins 10,11,12,13.pattern example on,off,on,off,on,off
 pinMode(13, OUTPUT);
 pinMode(12, OUTPUT);
 pinMode(11, OUTPUT);
 pinMode(10, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(10, HIGH);
  delay(0);
  digitalWrite(11,LOW);
  delay(0);
  digitalWrite(12, HIGH);
  delay(0);
  digitalWrite(13,LOW );
  delay(1000);
   digitalWrite(10, LOW);
  delay(0);
  digitalWrite(11,HIGH);
  delay(0);
  digitalWrite(12, LOW);
  delay(0);
  digitalWrite(13, HIGH );
  delay(1000);

}