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

Example Input: Perennial grass takes _ to five years before it is mature enough to produce adequate seed.
Example Output: three

Example Input: Cleavage is imperfect in _ directions, prismatically.
Example Output: two

Example Input: Children show _ symptoms of lead poisoning until irreversible brain damage has occurred.
Example Output:
no