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

Example Input: Zeolites have basically _ different structural variations.
Example Output: three

Example Input: Phosphates are made of _ phosphorus atom surrounded by four oxygen atoms.
Example Output: one

Example Input: Polyploidy is the condition in which each cell contains _ or more sets of chromosomes.
Example Output:
three