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

void loop() {
  int pb1State = digitalRead(2);
  int pb2State = digitalRead(3);
  if (pb1State == HIGH && pb2State == HIGH) {
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
    delay(200);
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
    delay(200);
  }
  else if (pb1State == HIGH) {
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
  }
  else if (pb2State == HIGH) {
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
  }
  else {
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
  }
}