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

Example Input: Women devote their lives to raising families of six, seven and _ children.
Example Output: eight

Example Input: Titanium is found in column _ along with chemically similar zirconium, hafnium, and thorium.
Example Output: four

Example Input: Termites live in large colonies of cooperating individuals of _ different castes.
Example Output:
three