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

Example Input: Induction also operates early in development, even before the _ layered embryo forms.
Example Output: three

Example Input: Blood pressure is really _ measurements, systolic and diastolic.
Example Output: two

Example Input: Liters are _ places to the right of hectoliters.
Example Output:
two