TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Puppies can start vaccinations at _ weeks.

SOLUTION: six

PROBLEM: Metals often crystallize in a _ dimensional version of the hexagonal closest packed structure.

SOLUTION: three

PROBLEM: Some spiders have up to _ or eight or twelve eyes.

SOLUTION:
six