#define LED1 23
#define LED2 22
#define LED3 21
#define LED4 19
#define LED5 18
#define LED6 5
#define LED7 17
#define LED8 16
#define LED9 4
#define LED10 2

void setup() {
  pinMode (LED1, OUTPUT);
  pinMode (LED2, OUTPUT);
  pinMode (LED3, OUTPUT);
  pinMode (LED4, OUTPUT);
  pinMode (LED5, OUTPUT);
  pinMode (LED6, OUTPUT);
  pinMode (LED7, OUTPUT);
  pinMode (LED8, OUTPUT);
  pinMode (LED9, OUTPUT);
  pinMode (LED10, OUTPUT);
}

void loop() {
 digitalWrite(LED1, HIGH);
  digitalWrite(LED10, HIGH);
  delay(200);

  digitalWrite(LED2, HIGH);
  digitalWrite(LED9, HIGH);
  delay(200);

  digitalWrite(LED3, HIGH);
  digitalWrite(LED8, HIGH);
  delay(200);

  digitalWrite(LED4, HIGH);
  digitalWrite(LED7, HIGH);
  delay(200);

  digitalWrite(LED5, HIGH);
  digitalWrite(LED6, HIGH);
  delay(200);

  /*Turning OFF*/

  digitalWrite(LED1, LOW);
  digitalWrite(LED10, LOW);
  delay(200);

  digitalWrite(LED2, LOW);
  digitalWrite(LED9, LOW);
  delay(200);

  digitalWrite(LED3, LOW);
  digitalWrite(LED8, LOW);
  delay(200);

  digitalWrite(LED4, LOW);
  digitalWrite(LED7, LOW);
  delay(200);

  digitalWrite(LED5, LOW);
  digitalWrite(LED6, LOW);
  delay(200);


}