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If the student's age is greater than $15.$ the grade should be "High School",

Create another class School with the following attribute:

student$\_$ list of type list.

containing Student objects

Implement the method for the School class. This method should take a list of Student objects as an argument and initialize the student$\_$list attribute with the provided list.

Create a method inside the School class called assign$\_$grades. This method should call the calculate$\_$grade method for each student in the student $2$ ist and set their student$\_$grade attribute accordingly.

Define another method in the School class called get$\_$students by$\_$grade. This method should take a string representing the grade le: si "Elementary", "Middle School": or "High School'$)$ as input and retum a list of student names tho belons to that grade. The search should be case insensitive.