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

Example Input: Black women giving birth have a four to _ higher rate of mortality than white women do.
Example Output: one

Example Input: Mice are fertile animals because female mice come into heat every _ to five days.
Example Output: four

Example Input: Sleep apnea is defined as a greater than _ second pause in respiration during sleep.
Example Output:
ten