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Bunuel
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(E) other fourth grade classes commonly experience similar reading comprehension improvements without using the reading basics course - Correct

Boil it down:
• We had a condition.
• We used a product
• Our condition improved by 50%
Conclusion: The product worked. Product was the cause behind the increase.

Gap:
• Whether the product really worked or could our condition have anyway improved by 50% without any help?
• Is there any other parameter that was helping silently?
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