Why does your commercial throw teachers under the bus? Students acting in it make comments like "I didn't learn much last year." This is disgraceful and it treats teachers with contempt. As an educator who has been teaching English to international students for over a decade, this is not only inaccurate, but a horrifying depiction of teachers. We are the true heroes of this country, and I for one do not appreciate your contempt of my fellow colleagues, friends and me. You should be ashamed of yourself. Deeply ashamed.

Write a method named addall that could be placed inside the hashintset class. this method accepts another hashintset as a parameter and adds all elements from that set into the current set, if they are not already present. for example, if a set s1 contains [1, 2, 3] and another set s2 contains [1, 7, 3, 9], the call of s1.addall(s2); would change s1 to store [1, 2, 3, 7, 9] in some order. you are allowed to call methods on your set and/or the other set. do not modify the set passed in. this method should run in o(n) time where n is the number of elements in the parameter set passed in.