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: Tapirs have hoofed toes, with four toes on the front feet and _ toes on the hind feet.
Example Output: three

Example Input: Current research focuses on _ fossorial rodent species.
Example Output:
three