In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Example Input: New species are believed to arrive in the Mediterranean at the rate of _ to five annually.
Example Output: four

Example Input: All children normally wake up four or _ times each night after dreams.
Example Output: five

Example Input: Ear infections occur most often in children between _ months and three years of age.
Example Output:
three