Changes

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* set scale: sets the scale of images displayed with show block
 
* set scale: sets the scale of images displayed with show block
 
* arc: move turtle along an arc
 
* arc: move turtle along an arc
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 +
Only available in Turtle Blocks:
 
* left: holds current x-coordinate value of the left edge of the screen (can be used in place of a number block)  
 
* left: holds current x-coordinate value of the left edge of the screen (can be used in place of a number block)  
 
* top: holds current y-coordinate value of the top edge of the screen (can be used in place of a number block)  
 
* top: holds current y-coordinate value of the top edge of the screen (can be used in place of a number block)  
 
* right: holds current x-coordinate value of the right edge of the screen (can be used in place of a number block)  
 
* right: holds current x-coordinate value of the right edge of the screen (can be used in place of a number block)  
* bottom: holds current y-coordinate value of the bottom edge of the screen (can be used in place of a number block)  
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* bottom: holds current y-coordinate value of the bottom edge of the screen (can be used in place of a number block)
    
====Pen Palette====
 
====Pen Palette====

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