Provide support for a reversed method of the PositionalList class that is similar to the given iter , but that iterates the elements in reversed order. Q327: Describe an implementation of the...

is similar to the given iter , but that iterates the elements in
reversed

order.

Q327: Describe an implementation of the PositionalList methods add last and

add before realized by using only methods in the set {is empty, first, last,

prev, next, add after, and add first}.