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

[EX Q]: Dialogue is _ sides working together toward a common understanding.
[EX A]: two

[EX Q]: All hairs have a life expectancy of _ to six years.
[EX A]: three

[EX Q]: Japan has over _ hundred varieties of cherry trees.
[EX A]:
four