#include <Servo.h>

const int in1=5;

const int in2=3;

const int in3=11;

const int in4=10;

void setup() {

  pinMode(in1, OUTPUT);

  pinMode(in2, OUTPUT);

  pinMode(in3, OUTPUT);

  pinMode(in4, OUTPUT);

}

void loop() {

  delay(2000);

  digitalWrite(in1, HIGH);

  digitalWrite(in2, HIGH);

  digitalWrite(in3, LOW);

  digitalWrite(in4, HIGH);

  delay(2000);// Wait for 2000 millisecond(s);

  digitalWrite(in1, LOW);

  digitalWrite(in2, HIGH);

  digitalWrite(in3, LOW);

  digitalWrite(in4, HIGH);

}

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