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

Ex Input:
Boolean operations is a method of combining _ meshes together.

Ex Output:
two

Ex Input:
Skunks tear out divots of turf that are _ to six inches in diameter.

Ex Output:
three

Ex Input:
Fuel cells operate quietly and are _ to low emissions, comparable to a battery-powered vehicle.

Ex Output:
zero