In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
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Question: Morocco has _ perennial rivers and many dams have been built with potential for power generation.

Answer: four


Question: Allergic rhinitis is the most common allergic disease, with one in _ Canadian adults affected.

Answer: five


Question: Wheat commonly has _ to six individual seminal roots.

Answer:
three