void setup() {
  // put your setup code here, to run once:
pinMode( 1, OUTPUT);
pinMode( 2, OUTPUT);
pinMode( 3, OUTPUT);
pinMode( 4, OUTPUT);
pinMode( 5, OUTPUT);
pinMode( 6, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite( 3, HIGH);
digitalWrite( 6, HIGH);
delay(750);
digitalWrite( 3, LOW );
digitalWrite( 6, LOW);
digitalWrite( 2, HIGH);
digitalWrite( 5, HIGH);
delay(600);
digitalWrite( 2, LOW);
digitalWrite( 5, LOW);
digitalWrite( 1, HIGH);
digitalWrite( 4, HIGH);
delay(750);
digitalWrite( 1, LOW);
digitalWrite( 4, LOW);

}