void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

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


void loop() {
  // State 1
  // LED: ON, ON, OFF,OFF
  // Duration: 2s
  digitalWrite(8, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, LOW);
  digitalWrite(7, LOW);
  delay(2000);


  // State 2
  // LED: OFF, ON, ON,OFF
  // Duration: 1.5s
  digitalWrite(8, LOW);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(7, LOW);
  delay(1500);


  // State 3
  // LED: OFF, OFF, ON,ON
  // Duration: 1s
  digitalWrite(8, LOW);
  digitalWrite(9, LOW);
  digitalWrite(10, HIGH);
  digitalWrite(7, HIGH);
  delay(1000);


 //State 4
 //LED::OFF,ON,OFF,ON
 //Duration:0.5s
  digitalWrite(8, HIGH);
  digitalWrite(9, LOW);
  digitalWrite(10, HIGH);
  digitalWrite(7, HIGH);
  delay(500);
}