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#include <Mouse.h>

void setup() {
  //The switch that will initiate the Mouse press
  pinMode(2, INPUT);
  //The switch that will terminate the Mouse press
  pinMode(3, INPUT);
  //initiate the Mouse library
  Mouse.begin();
}

void loop() {
  //if the switch attached to pin 2 is closed, press and hold the left mouse button
  if (digitalRead(2) == HIGH) {
    Mouse.press();
  }
  //if the switch attached to pin 3 is closed, release the left mouse button
  if (digitalRead(3) == HIGH) {
    Mouse.release();
  }
}