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@@ -1479,7 +1479,7 @@ recursively flatten the body of the program and also compute the list
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of variables used in the program. I recommend traversing the
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statements in the body of the program (after it has been flattened)
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and collect all variables that appear on the left-hand-side of an
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-assignment. Note that each variable should only occur ones in the list
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+assignment. Note that each variable should only occur once in the list
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of variables that you place in the \key{program} form.
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Take special care for programs such as the following that initialize
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jsiek