[plt-scheme] HTDP 25.1.2

From: wooks . (wookiz at hotmail.com)
Date: Mon Jul 24 11:52:51 EDT 2006

I am having problems with this but first off need to nail down my 
understanding of the problem specification.

What is the  contract for move-balls.

Is the expected visual effect

a) a bunch of balls being drawn on the canvas
b) each ball moving across the canvas simultaneously until it dissapears of 
the edge.

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