equal$($self$,$ second$\_$bag: $$Bag$)->$ bool:

This method compares the contents of a bag with the contents of a second bag provided as

a parameter. The method returns True if the bags are equal $($contain the same number of

elements, and also contain the same elements without regard to the order of elements$).$

Otherwise, it returns False. An empty bag is only considered equal to another empty bag.

This method must not change the contents of either bag. You are allowed to directly

access all instance variables of second$\_$bag, but you may not create any additional data

structures, nor sort either bag. The runtime complexity of this implementation should be

no greater than O$($N$2).$