int redled = 11; 
int yellowled = 9; 
int greenled = 4; 
void setup ()
{
 pinMode (redled, OUTPUT); 
 pinMode (yellowled, OUTPUT); 
 pinMode (greenled, OUTPUT); 
}
void loop ()
{
 digitalWrite (redled, HIGH);
 delay (1000);
 digitalWrite (redled, LOW); 
 digitalWrite (yellowled, HIGH);
 delay (200);
 digitalWrite (yellowled, LOW);
 digitalWrite (greenled, HIGH);
 delay (1000);
 digitalWrite (greenled, LOW);
}