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

Example Input: Most women experience a menstrual period _ to six weeks after a miscarriage.
Example Output: four

Example Input: Roundworms are fairly large worms that can grow to be _ or five inches long.
Example Output: four

Example Input: Predation influences organisms at _ ecological levels.
Example Output:
two