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

Example Input: Psychoanalysis is an intensive form of psychotherapy that meets _ to five times a week.
Example Output: four

Example Input: Boolean operations is a method of combining _ meshes together.
Example Output: two

Example Input: Cubs stay with their mothers from one and a half to _ years.
Example Output:
three