int stt = 0;

void setup() {
for (int i=6; i<=13; i++)
pinMode(i, OUTPUT);
attachInterrupt(digitalPinToInterrupt(2), doichedo, RISING);
}

void doichedo() {
  stt++;
  if (stt>6) stt=1;

}

void loop(){
if (stt==1) {
  digitalWrite(6, HIGH);
  digitalWrite(8, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(12, HIGH);
  delay(500);
  for (int i=3; i<=6; i++){
    digitalWrite(2*i, LOW);
    digitalWrite(2*i+1, HIGH);
    }
  delay(500);
  digitalWrite(7, LOW);
  digitalWrite(9, LOW);
  digitalWrite(11, LOW);
  digitalWrite(13, LOW);
}

if (stt==2) {
  for (int i=6; i<=13; i++){
    digitalWrite(i, HIGH);
    delay(500);
    digitalWrite(i, LOW);
  }
}

if (stt==3) {
  for (int i=6; i<=13; i++){
    digitalWrite(i, HIGH);
    digitalWrite(i+1, HIGH);
    if (i==13) digitalWrite(6, HIGH);
    delay(500);
    digitalWrite(i, LOW);
  }
}

if (stt==4) {
  for (int i=6; i<=13; i++){
  if (i<=9) {
  digitalWrite(i, HIGH);
  digitalWrite(19-i, HIGH);
  delay(500);}
  if (i>=10) {
  digitalWrite(i, LOW);
  digitalWrite(19-i, LOW);
  delay(500);
  }
  }
}

if (stt==5) {
 for (int i=0; i<8; i++) {
  for (int j=0; j<(8-i); j++) {
    for (int t=0; t<=i; t++) {
      digitalWrite((j+6+t), HIGH);
    }
    delay(500);
    digitalWrite((j+6), LOW);
  }
  for (int h=6; h<14; h++)
  digitalWrite(h, LOW);
 }
}

if (stt==6) {
  for (int i=0; i<=7; i++) {
    for (int j=0; j<=(7-i); j++) {
      digitalWrite((j+6), HIGH);
      delay(500);
      if (j<(7-i)) 
      digitalWrite((j+6), LOW);
    }
  }
  for (int t=6; t<14; t++){
    digitalWrite(t, LOW);
    delay(500);
  }
}

}