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

Example Input: Nymphs feed for five to _ weeks before entering the adult stage.
Example Output: eight

Example Input: Seasons mean very little in our world of _ hemispheres.
Example Output: two

Example Input: Young otters begin playing at _ weeks of age and learn to swim at about seven weeks of age.
Example Output:
four