void setup() {
  // put your setup code here, to run once:
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  sequence1();
  sequence2();
  sequence3();
  sequence4(); 
  sequence5(); 
  sequence6();
}

//CODE FOR SEQUENCE #1
void sequence1(){
  digitalWrite(7, HIGH);
  digitalWrite(8, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(11, HIGH);
  digitalWrite(12, HIGH);
  delay(500);
  digitalWrite(7, LOW);
  digitalWrite(8, LOW);
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);
  digitalWrite(11, LOW);
  digitalWrite(12, LOW);
  delay(500);
}

//CODE FOR SEQUENCE #2
void sequence2(){
  digitalWrite(7, HIGH);
  delay(500);
  digitalWrite(8, HIGH);
  delay(500);
  digitalWrite(9, HIGH);
  delay(500);
  digitalWrite(10, HIGH);
  delay(500);
  digitalWrite(11, HIGH);
  delay(500);
  digitalWrite(12, HIGH);
  delay(500);
  digitalWrite(7, LOW);
  delay(500);
  digitalWrite(8, LOW);
  delay(500);
  digitalWrite(9, LOW);
  delay(500);
  digitalWrite(10, LOW);
  delay(500);
  digitalWrite(11, LOW);
  delay(500);
  digitalWrite(12, LOW);
  delay(500);
}

//CODE FOR SEQUENCE #3
void sequence3(){
  digitalWrite(7, HIGH);
  delay(500);
  digitalWrite(7, LOW);
  digitalWrite(8, HIGH);
  delay(500);
  digitalWrite(8, LOW);
  digitalWrite(9, HIGH);
  delay(500);
  digitalWrite(9, LOW);
  digitalWrite(10, HIGH);
  delay(500);
  digitalWrite(10, LOW);
  digitalWrite(11, HIGH);
  delay(500);
  digitalWrite(11, LOW);
  digitalWrite(12, HIGH);
  delay(500);
  digitalWrite(12, LOW);
  delay(500);
}

//CODE FOR SEQUENCE #4
void sequence4(){
  digitalWrite(8, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(12, HIGH);
  delay(500);
  digitalWrite(8, LOW);
  digitalWrite(10, LOW);
  digitalWrite(12, LOW);
  delay(500);
  digitalWrite(7, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(11, HIGH);
  delay(500);
  digitalWrite(7, LOW);
  digitalWrite(9, LOW);
  digitalWrite(11, LOW);
  delay(500);
}

//ANOTHER EXAMPLE: SEQUENCE #5
void sequence5(){
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  delay(500);
  digitalWrite(8, HIGH);
  digitalWrite(11, HIGH);
  delay(500);
  digitalWrite(7, HIGH);
  digitalWrite(12, HIGH);
  delay(500);
  digitalWrite(7, LOW);
  digitalWrite(12, LOW);
  delay(500);
  digitalWrite(8, LOW);
  digitalWrite(11, LOW);
  delay(500);
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);
  delay(500);
}

//ANOTHER EXAMPLE: SEQUENCE #6
void sequence6(){
  digitalWrite(7, HIGH);
  digitalWrite(12, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  delay(500);
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);
  delay(500);
  digitalWrite(8, HIGH);
  digitalWrite(11, HIGH);
  delay(500);
  digitalWrite(8, LOW);
  digitalWrite(11, LOW);
  delay(500);
  digitalWrite(7, LOW);
  digitalWrite(12, LOW);
  delay(500);
}