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hello_world by disc 

Turtle.draw do
  background lightblue
  pencolor black
  4.times do
    forward 50
    turnright 90
  end
  forward 50
  4.times do
    forward 50
    turnright 90
  end
  turnright 90
  forward 50
  4.times do
    forward 50
    turnright 90
  end
  turnright 90
  forward 50
  4.times do
    forward 50
    turnright 90
  end
  turnright 90
  forward 50
  4.times do
    forward 50 
    turnright 90
  end
end