Write a method named equals2 that could be placed inside the HashSet2 class.
This method accepts any object reference o as a parameter and returns true if o refers to another HashSet2 object containing exactly the same set of items as this set.
It does not matter if the two sets have the same internal hash table length or element ordering in their linked lists, so long as exactly the same overall elements are stored in both sets; no more, no less.
For example, if a set s1 contains [a, b, c] and another set s2 contains [b, c, a], the call of s1.equals(s2) would return true.
If set s2 instead contained [b, c, d] or [b, c] or [b, c, d, a] or any other contents not exactly equal to s1's set of elements, your method would return false.
You are allowed to call methods on your set and/or the other set as needed. Do not modify the set passed in. This method should run in O(N) time where N is the number of elements in either of the two sets.
(NOTE: To be compatible with our site and avoid conflicting with Java's java.util.HashSet, our HashSet is renamed HashSet2 here, and equals is renamed to equals2 to avoid conflicting with Java's existing equals method.)
