void setup() {
  // Declare the pins here:
  pinMode(12, OUTPUT); 
  pinMode(11, OUTPUT); 
  pinMode(10, OUTPUT); 

}

void loop() {
//code to glow and blink LED Left to Right
  // use code for declared 12 pins i.e Red LED here:
  digitalWrite(12, HIGH);
  delay(100); // Wait for 1000 millisecond(s)
  digitalWrite(12, LOW);
  delay(100); // Wait for 1000 millisecond(s)

  // use code for declared 11 pins i.e Blue LED here:
  digitalWrite(11, HIGH);
  delay(100); // Wait for 1000 millisecond(s)
  digitalWrite(11, LOW);
  delay(100); // Wait for 1000 millisecond(s)

  // use code for declared 10 pins i.e Green LED here:
  digitalWrite(10, HIGH);
  delay(100); // Wait for 1000 millisecond(s)
  digitalWrite(10, LOW);
  delay(100); // Wait for 1000 millisecond(s)

}