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

Example Input: Trees can also be air layered but air layering usually takes four to _ months to be successful.
Example Output: six

Example Input: Bridge is a partnership game requiring _ players.
Example Output: four

Example Input: Today there are _ non-Euclidean geometries of particular interest to students of mathematics.
Example Output:
three