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

Input: Consider Input: Most women have two or _ mastectomy bras.

Output: three


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

Output: four


Input: Consider Input: Planaria has rudimentary eyes which produce _ images but detect direction.


Output: no