const int led1 = 2;
const int led2 = 3;
const int led3 = 4;
const int led4 = 5;
const int led5 = 6;

void setup() {
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
}

void toby(int ledpin, int on_off, int mydelay) {
  digitalWrite(ledpin, on_off);
  delay(mydelay);
}

void loop() {
  toby(2, 1, 200);
  toby(2, 0, 100);
  toby(3, 1, 200);
  toby(3, 0, 100);
  toby(4, 1, 200);
  toby(4, 0, 100);
  toby(5, 1, 200);
  toby(5, 0, 100);
  toby(6, 1, 200);
  toby(6, 0, 100);
}