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/usr/share/doc/arduino-mk/examples/Blink/Blink.ino is in arduino-mk 1.5-2.

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/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
  This example code is in the public domain.
 */

void setup() {                
	// initialize the digital pin as an output.
	// Pin 13 has an LED connected on most Arduino boards:
	pinMode(13, OUTPUT);     
}

void loop() {
	digitalWrite(13, HIGH);   // set the LED on
	delay(1000);              // wait for a second
	digitalWrite(13, LOW);    // set the LED off
	delay(1000);              // wait for a second
}