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

Input: Consider Input: Knives have _ cutting edges for double cutting life.

Output: two

Input: Consider Input: Arthritis is the leading cause of disability in the state affecting about one in _ adults.

Output: three

Input: Consider Input: Biological information is replicated as the _ strands are separated.
Output: two