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

Example Input: Echocardiography demonstrates in clear, graphic fashion the _ cardiac chambers and four valves.
Example Output: four

Example Input: Corms are undifferentiated, uniform, and contain _ rings when cut apart.
Example Output: no

Example Input: Syncretism is the fusion of _ or more religious systems.
Example Output:
two