Given the following passage  "Vinaya is the specific moral code for monks and nuns. It includes the Patimokkha, a set of 227 rules for monks in the Theravadin recension. The precise content of the vinayapitaka (scriptures on Vinaya) differs slightly according to different schools, and different schools or subschools set different standards for the degree of adherence to Vinaya. Novice-monks use the ten precepts, which are the basic precepts for monastics.",  answer the following question. Note that the answer is present within the text.  Question: Why do some monks have stricter rules than others?
Answer:
subschools set different standards