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

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

Example Input: Premolars have one, two, and sometimes _ canals.
Example Output: three

Example Input: Terminators are of _ types.
Example Output:
two