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

Input: Consider Input: Tetrachoric correlation is _ artificially dichotomous variables.

Output: two


Input: Consider Input: Some manatees have _ or four nails on the tip of each flipper.

Output: three


Input: Consider Input: Osteoporosis is the most common bone disease, affecting one in three women and _ in twelve men.


Output: one