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

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

Ex Output:
four


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

Ex Output:
one


Ex Input:
Geckos have _ eyelids .

Ex Output:

no