int red[]={14,27,15,19};
int yel[]={12,26,2,18};
int grn[]={13,25,4,5};
int i;
void setup() 
{

  Serial.begin(115200);
  for(int i=0;i<4;i++)
  {
 pinMode(red[i],OUTPUT);
 pinMode(yel[i],OUTPUT);
 pinMode(grn[i],OUTPUT);
  }
  i=0;
   
}

void loop() {
  for(i=1;i<4;i++)
  digitalWrite(red[i], HIGH);
  digitalWrite(grn[0], HIGH);
  delay(3000);
  for(int t=0,int a=1,int b=2;)
  digitalWrite(red[1], LOW);
  digitalWrite(grn[0], LOW);
  for(i=0;i<2;i++)
  digitalWrite(yel[i], HIGH);
  delay(750);
  digitalWrite(grn[1], HIGH);
  digitalWrite(red[0], HIGH);
  for(i=0;i<2;i++)
  digitalWrite(yel[i], LOW);
  delay(3000);
  
  digitalWrite(red[2], LOW);
  digitalWrite(grn[1], LOW);
  for(i=1;i<3;i++)
  digitalWrite(yel[i], HIGH);
  delay(750);
  digitalWrite(grn[2], HIGH);
  digitalWrite(red[1], HIGH);
  for(i=1;i<3;i++)
  digitalWrite(yel[i], LOW);
  delay(3000);
  
  
  digitalWrite(red[3], LOW);
  digitalWrite(grn[2], LOW);
  for(i=2;i<4;i++)
  digitalWrite(yel[i], HIGH);
  delay(750);
  digitalWrite(grn[3], HIGH);
  digitalWrite(red[2], HIGH);
  for(i=2;i<4;i++)
  digitalWrite(yel[i], LOW);
  delay(3000);

  
  digitalWrite(red[0], LOW);
  digitalWrite(grn[3], LOW);
  digitalWrite(yel[3], HIGH);
  digitalWrite(yel[0], HIGH);
  delay(750);
  digitalWrite(grn[0], HIGH);
  digitalWrite(red[3], HIGH);
  digitalWrite(yel[3], LOW);
  digitalWrite(yel[0], LOW);
  delay(3000);
  
   

 
  
}