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

Input: Consider Input: Birds bitten by infected mosquitoes are infectious from _ to eight days.

Output: four

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

Output: one

Input: Consider Input: Bone marrow replenishes itself fully within _ weeks.
Output: two