int pinler[5]={2,3,4,5,6};
void setup()
{
for(int x=0;x<5;x++)
{
  pinMode(pinler[x],OUTPUT);
  } 
}

void loop() 
{
for(int x=0;x<3;x++)
{
digitalWrite(pinler[x],HIGH);
digitalWrite(pinler[4-x],HIGH);
delay(1000);

}
for(int x=2;x>=0;x--)
{
digitalWrite(pinler[x],LOW);
digitalWrite(pinler[4-x],LOW);
delay(1000);

}
}